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  1. 20 Apr, 2017 4 commits
  3. 19 Apr, 2017 4 commits
    • Cong Wang's avatar
      nsfs: mark dentry with DCACHE_RCUACCESS · 073c516f
      Cong Wang authored 
      Andrey reported a use-after-free in __ns_get_path():

  spin_lock include/linux/spinlock.h:299 [inline]
  lockref_get_not_dead+0x19/0x80 lib/lockref.c:179
  __ns_get_path+0x197/0x860 fs/nsfs.c:66
  open_related_ns+0xda/0x200 fs/nsfs.c:143
  sock_ioctl+0x39d/0x440 net/socket.c:1001
  vfs_ioctl fs/ioctl.c:45 [inline]
  do_vfs_ioctl+0x1bf/0x1780 fs/ioctl.c:685
  SYSC_ioctl fs/ioctl.c:700 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691

We are under rcu read lock protection at that point:

        rcu_read_lock();
        d = atomic_long_read(&ns->stashed);
        if (!d)
                goto slow;
        dentry = (struct dentry *)d;
        if (!lockref_get_not_dead(&dentry->d_lockref))
                goto slow;
        rcu_read_unlock();

but don't use a proper RCU API on the free path, therefore a parallel
__d_free() could free it at the same time.  We need to mark the stashed
dentry with DCACHE_RCUACCESS so that __d_free() will be called after all
readers leave RCU.

Fixes: e149ed2b ("take the targets of /proc/*/ns/* symlinks to separate fs")
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reported-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      073c516f
    • Michal Hocko's avatar
      mm: make mm_percpu_wq non freezable · 80d136e1
      Michal Hocko authored 
      Geert has reported a freeze during PM resume and some additional
debugging has shown that the device_resume worker cannot make a forward
progress because it waits for an event which is stuck waiting in
drain_all_pages:

  INFO: task kworker/u4:0:5 blocked for more than 120 seconds.
        Not tainted 4.11.0-rc7-koelsch-00029-g005882e5-dirty #3476
  "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  kworker/u4:0    D    0     5      2 0x00000000
  Workqueue: events_unbound async_run_entry_fn
    __schedule
    schedule
    schedule_timeout
    wait_for_common
    dpm_wait_for_superior
    device_resume
    async_resume
    async_run_entry_fn
    process_one_work
    worker_thread
    kthread
  [...]
  bash            D    0  1703   1694 0x00000000
    __schedule
    schedule
    schedule_timeout
    wait_for_common
    flush_work
    drain_all_pages
    start_isolate_page_range
    alloc_contig_range
    cma_alloc
    __alloc_from_contiguous
    cma_allocator_alloc
    __dma_alloc
    arm_dma_alloc
    sh_eth_ring_init
    sh_eth_open
    sh_eth_resume
    dpm_run_callback
    device_resume
    dpm_resume
    dpm_resume_end
    suspend_devices_and_enter
    pm_suspend
    state_store
    kernfs_fop_write
    __vfs_write
    vfs_write
    SyS_write
  [...]
  Showing busy workqueues and worker pools:
  [...]
  workqueue mm_percpu_wq: flags=0xc
    pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=0/0
      delayed: drain_local_pages_wq, vmstat_update
    pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=0/0
      delayed: drain_local_pages_wq BAR(1703), vmstat_update

Tetsuo has properly noted that mm_percpu_wq is created as WQ_FREEZABLE
so it is frozen this early during resume so we are effectively
deadlocked.  Fix this by dropping WQ_FREEZABLE when creating
mm_percpu_wq.  We really want to have it operational all the time.

Fixes: ce612879 ("mm: move pcp and lru-pcp draining into single wq")
Reported-and-tested-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Debugged-by: default avatarTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      80d136e1
    • Linus Torvalds's avatar
      Merge tag 'backlight-for-v4.11' of git://git.linaro.org/people/daniel.thompson/linux · c4bac97b
      Linus Torvalds authored 
      Pull backlight fix from Daniel Thompson:
 "Normally pull requests for backlight come from Lee Jones (and will
  continue to do so) but the bug fixed here is annoying for few people
  so I'm providing a little holiday cover.

  Fix a single bug in the PWM backlight driver and make it play nice
  with a wider range of GPIO devices. This bug is a regression and was
  independently discovered by Geert Uytterhoevan and Paul Kocialkowski
  (and is tested by both)"

* tag 'backlight-for-v4.11' of git://git.linaro.org/people/daniel.thompson/linux:
  backlight: pwm_bl: Fix GPIO out for unimplemented .get_direction()
      c4bac97b
    • Geert Uytterhoeven's avatar
      backlight: pwm_bl: Fix GPIO out for unimplemented .get_direction() · 892c7788
      Geert Uytterhoeven authored 
      Commit 7613c922 ("backlight: pwm_bl: Move the checks for initial
power state to a separate function") not just moved some code, but made
slight changes in semantics.

If a gpiochip doesn't implement the optional .get_direction() callback,
gpiod_get_direction always returns -EINVAL, which is never equal to
GPIOF_DIR_IN, leading to the GPIO not being configured for output.

To avoid this, invert the test and check for not GPIOF_DIR_OUT instead,
like the original code did.

This restores the display on r8a7740/armadillo.

Fixes: 7613c922 ("backlight: pwm_bl: Move the checks for initial power state to a separate function")
Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
      892c7788
  5. 18 Apr, 2017 9 commits
  7. 17 Apr, 2017 17 commits
    • Linus Torvalds's avatar
      Merge branch 'parisc-4.11-5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · 20bb78f6
      Linus Torvalds authored 
      Pull parisc fix from Helge Deller:
 "One patch which fixes get_user() for 64-bit values on 32-bit kernels.

  Up to now we lost the upper 32-bits of the returned 64-bit value"

* 'parisc-4.11-5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Fix get_user() for 64-bit value on 32-bit kernel
      20bb78f6
    • Sachin Prabhu's avatar
      cifs: Do not send echoes before Negotiate is complete · 62a6cfdd
      Sachin Prabhu authored 
      commit 4fcd1813 ("Fix reconnect to not defer smb3 session reconnect
long after socket reconnect") added support for Negotiate requests to
be initiated by echo calls.

To avoid delays in calling echo after a reconnect, I added the patch
introduced by the commit b8c60012 ("Call echo service immediately
after socket reconnect").

This has however caused a regression with cifs shares which do not have
support for echo calls to trigger Negotiate requests. On connections
which need to call Negotiation, the echo calls trigger an error which
triggers a reconnect which in turn triggers another echo call. This
results in a loop which is only broken when an operation is performed on
the cifs share. For an idle share, it can DOS a server.

The patch uses the smb_operation can_echo() for cifs so that it is
called only if connection has been already been setup.

kernel bz: 194531
Signed-off-by: default avatarSachin Prabhu <sprabhu@redhat.com>
Tested-by: default avatarJonathan Liu <net147@gmail.com>
Acked-by: default avatarPavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
      62a6cfdd
    • Namhyung Kim's avatar
      ftrace: Fix function pid filter on instances · d879d0b8
      Namhyung Kim authored 
      When function tracer has a pid filter, it adds a probe to sched_switch
to track if current task can be ignored.  The probe checks the
ftrace_ignore_pid from current tr to filter tasks.  But it misses to
delete the probe when removing an instance so that it can cause a crash
due to the invalid tr pointer (use-after-free).

This is easily reproducible with the following:

  # cd /sys/kernel/debug/tracing
  # mkdir instances/buggy
  # echo $$ > instances/buggy/set_ftrace_pid
  # rmdir instances/buggy

  ============================================================================
  BUG: KASAN: use-after-free in ftrace_filter_pid_sched_switch_probe+0x3d/0x90
  Read of size 8 by task kworker/0:1/17
  CPU: 0 PID: 17 Comm: kworker/0:1 Tainted: G    B           4.11.0-rc3  #198
  Call Trace:
   dump_stack+0x68/0x9f
   kasan_object_err+0x21/0x70
   kasan_report.part.1+0x22b/0x500
   ? ftrace_filter_pid_sched_switch_probe+0x3d/0x90
   kasan_report+0x25/0x30
   __asan_load8+0x5e/0x70
   ftrace_filter_pid_sched_switch_probe+0x3d/0x90
   ? fpid_start+0x130/0x130
   __schedule+0x571/0xce0
   ...

To fix it, use ftrace_clear_pids() to unregister the probe.  As
instance_rmdir() already updated ftrace codes, it can just free the
filter safely.

Link: http://lkml.kernel.org/r/20170417024430.21194-2-namhyung@kernel.org

Fixes: 0c8916c3 ("tracing: Add rmdir to remove multibuffer instances")
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Reviewed-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      d879d0b8
    • David S. Miller's avatar
      Merge branch 'bpf-fixes' · acf167f3
      David S. Miller authored 
      Daniel Borkmann says:

====================
Two BPF fixes

The set fixes cb_access and xdp_adjust_head bits in struct bpf_prog,
that are used for requirement checks on the program rather than f.e.
heuristics. Thus, for tail calls, we cannot make any assumptions and
are forced to set them.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      acf167f3
    • Daniel Borkmann's avatar
      bpf: fix checking xdp_adjust_head on tail calls · c2002f98
      Daniel Borkmann authored 
      Commit 17bedab2 ("bpf: xdp: Allow head adjustment in XDP prog")
added the xdp_adjust_head bit to the BPF prog in order to tell drivers
that the program that is to be attached requires support for the XDP
bpf_xdp_adjust_head() helper such that drivers not supporting this
helper can reject the program. There are also drivers that do support
the helper, but need to check for xdp_adjust_head bit in order to move
packet metadata prepended by the firmware away for making headroom.

For these cases, the current check for xdp_adjust_head bit is insufficient
since there can be cases where the program itself does not use the
bpf_xdp_adjust_head() helper, but tail calls into another program that
uses bpf_xdp_adjust_head(). As such, the xdp_adjust_head bit is still
set to 0. Since the first program has no control over which program it
calls into, we need to assume that bpf_xdp_adjust_head() helper is used
upon tail calls. Thus, for the very same reasons in cb_access, set the
xdp_adjust_head bit to 1 when the main program uses tail calls.

Fixes: 17bedab2 ("bpf: xdp: Allow head adjustment in XDP prog")
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c2002f98
    • Daniel Borkmann's avatar
      bpf: fix cb access in socket filter programs on tail calls · 6b1bb01b
      Daniel Borkmann authored 
      Commit ff936a04 ("bpf: fix cb access in socket filter programs")
added a fix for socket filter programs such that in i) AF_PACKET the
20 bytes of skb->cb[] area gets zeroed before use in order to not leak
data, and ii) socket filter programs attached to TCP/UDP sockets need
to save/restore these 20 bytes since they are also used by protocol
layers at that time.

The problem is that bpf_prog_run_save_cb() and bpf_prog_run_clear_cb()
only look at the actual attached program to determine whether to zero
or save/restore the skb->cb[] parts. There can be cases where the
actual attached program does not access the skb->cb[], but the program
tail calls into another program which does access this area. In such
a case, the zero or save/restore is currently not performed.

Since the programs we tail call into are unknown at verification time
and can dynamically change, we need to assume that whenever the attached
program performs a tail call, that later programs could access the
skb->cb[], and therefore we need to always set cb_access to 1.

Fixes: ff936a04 ("bpf: fix cb access in socket filter programs")
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6b1bb01b
    • Florian Westphal's avatar
      ipv6: drop non loopback packets claiming to originate from ::1 · 0aa8c13e
      Florian Westphal authored 
      We lack a saddr check for ::1. This causes security issues e.g. with acls
permitting connections from ::1 because of assumption that these originate
from local machine.

Assuming a source address of ::1 is local seems reasonable.
RFC4291 doesn't allow such a source address either, so drop such packets.
Reported-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0aa8c13e
    • Stephen Boyd's avatar
      Merge tag 'sunxi-clk-fixes-for-4.11-2-bis' of... · e7590308
      Stephen Boyd authored 
      Merge tag 'sunxi-clk-fixes-for-4.11-2-bis' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux into clk-fixes

Pull Allwinner clock fixes for 4.11 from Maxime Ripard:

Two build errors fixes for the sunxi-ng drivers.

The two other patches fix random CPU crashes happening on the A33 since
CPUFreq has been enabled in 4.11.

* tag 'sunxi-clk-fixes-for-4.11-2-bis' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux:
  clk: sunxi-ng: a33: gate then ungate PLL CPU clk after rate change
  clk: sunxi-ng: Add clk notifier to gate then ungate PLL clocks
  clk: sunxi-ng: fix build failure in ccu-sun9i-a80 driver
  clk: sunxi-ng: fix build error without CONFIG_RESET_CONTROLLER
      e7590308
    • David S. Miller's avatar
      Merge branch 'mediatek-tx-bugs' · 71947f0f
      David S. Miller authored 
      Sean Wang says:

====================
mediatek: Fix crash caused by reporting inconsistent skb->len to BQL

Changes since v1:
- fix inconsistent enumeration which easily causes the potential bug

The series fixes kernel BUG caused by inconsistent SKB length reported
into BQL. The reason for inconsistent length comes from hardware BUG which
results in different port number carried on the TXD within the lifecycle of
SKB. So patch 2) is proposed for use a software way to track which port
the SKB involving instead of hardware way. And patch 1) is given for another
issue I found which causes TXD and SKB inconsistency that is not expected
in the initial logic, so it is also being corrected it in the series.

The log for the kernel BUG caused by the issue is posted as below.

[  120.825955] kernel BUG at ... lib/dynamic_queue_limits.c:26!
[  120.837684] Internal error: Oops - BUG: 0 [#1] SMP ARM
[  120.842778] Modules linked in:
[  120.845811] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.11.0-rc1-191576-gdbcef47 #35
[  120.853488] Hardware name: Mediatek Cortex-A7 (Device Tree)
[  120.859012] task: c1007480 task.stack: c1000000
[  120.863510] PC is at dql_completed+0x108/0x17c
[  120.867915] LR is at 0x46
[  120.870512] pc : [<c03c19c8>]    lr : [<00000046>]    psr: 80000113
[  120.870512] sp : c1001d58  ip : c1001d80  fp : c1001d7c
[  120.881895] r10: 0000003e  r9 : df6b3400  r8 : 0ed86506
[  120.887075] r7 : 00000001  r6 : 00000001  r5 : 0ed8654c  r4 : df0135d8
[  120.893546] r3 : 00000001  r2 : df016800  r1 : 0000fece  r0 : df6b3480
[  120.900018] Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  120.907093] Control: 10c5387d  Table: 9e27806a  DAC: 00000051
[  120.912789] Process swapper/0 (pid: 0, stack limit = 0xc1000218)
[  120.918744] Stack: (0xc1001d58 to 0xc1002000)

....

121.085331] 1fc0: 00000000 c0a52a28 00000000 c10855d4 c1003c58 c0a52a24 c100885c 8000406a
[  121.093444] 1fe0: 410fc073 00000000 00000000 c1001ff8 8000807c c0a009cc 00000000 00000000
[  121.101575] [<c03c19c8>] (dql_completed) from [<c04cb010>] (mtk_napi_tx+0x1d0/0x37c)
[  121.109263] [<c04cb010>] (mtk_napi_tx) from [<c05e28cc>] (net_rx_action+0x24c/0x3b8)
[  121.116951] [<c05e28cc>] (net_rx_action) from [<c010152c>] (__do_softirq+0xe4/0x35c)
[  121.124638] [<c010152c>] (__do_softirq) from [<c012a624>] (irq_exit+0xe8/0x150)
[  121.131895] [<c012a624>] (irq_exit) from [<c017750c>] (__handle_domain_irq+0x70/0xc4)
[  121.139666] [<c017750c>] (__handle_domain_irq) from [<c0101404>] (gic_handle_irq+0x58/0x9c)
[  121.147953] [<c0101404>] (gic_handle_irq) from [<c010e18c>] (__irq_svc+0x6c/0x90)
[  121.155373] Exception stack(0xc1001ef8 to 0xc1001f40)
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      71947f0f
    • Sean Wang's avatar
      net: ethernet: mediatek: fix inconsistency of port number carried in TXD · 134d2152
      Sean Wang authored 
      Fix port inconsistency on TXD due to hardware BUG that would cause
different port number is carried on the same TXD between tx_map()
and tx_unmap() with the iperf test. It would cause confusing BQL
logic which leads to kernel panic when dual GMAC runs concurrently.
Signed-off-by: default avatarSean Wang <sean.wang@mediatek.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      134d2152
    • Sean Wang's avatar
      net: ethernet: mediatek: fix inconsistency between TXD and the used buffer · 81d2dd09
      Sean Wang authored 
      Fix inconsistency between the TXD descriptor and the used buffer that
would cause unexpected logic at mtk_tx_unmap() during skb housekeeping.
Signed-off-by: default avatarSean Wang <sean.wang@mediatek.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      81d2dd09
    • Grygorii Strashko's avatar
      net: phy: micrel: fix crash when statistic requested for KSZ9031 phy · bfe72442
      Grygorii Strashko authored 
      Now the command:
	ethtool --phy-statistics eth0
will cause system crash with meassage "Unable to handle kernel NULL pointer
dereference at virtual address 00000010" from:

 (kszphy_get_stats) from [<c069f1d8>] (ethtool_get_phy_stats+0xd8/0x210)
 (ethtool_get_phy_stats) from [<c06a0738>] (dev_ethtool+0x5b8/0x228c)
 (dev_ethtool) from [<c06b5484>] (dev_ioctl+0x3fc/0x964)
 (dev_ioctl) from [<c0679f7c>] (sock_ioctl+0x170/0x2c0)
 (sock_ioctl) from [<c02419d4>] (do_vfs_ioctl+0xa8/0x95c)
 (do_vfs_ioctl) from [<c02422c4>] (SyS_ioctl+0x3c/0x64)
 (SyS_ioctl) from [<c0107d60>] (ret_fast_syscall+0x0/0x44)

The reason: phy_driver structure for KSZ9031 phy has no .probe() callback
defined. As result, struct phy_device *phydev->priv pointer will not be
initializes (null).
This issue will affect also following phys:
 KSZ8795, KSZ886X, KSZ8873MLL, KSZ9031, KSZ9021, KSZ8061, KS8737

Fix it by:
- adding .probe() = kszphy_probe() callback to KSZ9031, KSZ9021
phys. The kszphy_probe() can be re-used as it doesn't do any phy specific
settings.
- removing statistic callbacks from other phys (KSZ8795, KSZ886X,
KSZ8873MLL, KSZ8061, KS8737) as they doesn't have corresponding
statistic counters.

Fixes: 2b2427d0 ("phy: micrel: Add ethtool statistics counters")
Signed-off-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bfe72442
    • David Ahern's avatar
      net: vrf: Fix setting NLM_F_EXCL flag when adding l3mdev rule · 426c87ca
      David Ahern authored 
      Only need 1 l3mdev FIB rule. Fix setting NLM_F_EXCL in the nlmsghdr.

Fixes: 1aa6c4f6 ("net: vrf: Add l3mdev rules on first device create")
Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      426c87ca
    • George Cherian's avatar
      net: thunderx: Fix set_max_bgx_per_node for 81xx rgx · b47a57a2
      George Cherian authored 
      Add the PCI_SUBSYS_DEVID_81XX_RGX and use the same to set
the max bgx per node count.

This fixes the issue intoduced by following commit
78aacb6f net: thunderx: Fix invalid mac addresses for node1 interfaces
With this commit the max_bgx_per_node for 81xx is set as 2 instead of 3
because of which num_vfs is always calculated as zero.
Signed-off-by: default avatarGeorge Cherian <george.cherian@cavium.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b47a57a2
    • Willem de Bruijn's avatar
      net-timestamp: avoid use-after-free in ip_recv_error · 1862d620
      Willem de Bruijn authored 
      Syzkaller reported a use-after-free in ip_recv_error at line

    info->ipi_ifindex = skb->dev->ifindex;

This function is called on dequeue from the error queue, at which
point the device pointer may no longer be valid.

Save ifindex on enqueue in __skb_complete_tx_timestamp, when the
pointer is valid or NULL. Store it in temporary storage skb->cb.

It is safe to reference skb->dev here, as called from device drivers
or dev_queue_xmit. The exception is when called from tcp_ack_tstamp;
in that case it is NULL and ifindex is set to 0 (invalid).

Do not return a pktinfo cmsg if ifindex is 0. This maintains the
current behavior of not returning a cmsg if skb->dev was NULL.

On dequeue, the ipv4 path will cast from sock_exterr_skb to
in_pktinfo. Both have ifindex as their first element, so no explicit
conversion is needed. This is by design, introduced in commit
0b922b7a ("net: original ingress device index in PKTINFO"). For
ipv6 ip6_datagram_support_cmsg converts to in6_pktinfo.

Fixes: 829ae9d6 ("net-timestamp: allow reading recv cmsg on errqueue with origin tstamp")
Reported-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1862d620
    • WANG Cong's avatar
      ipv4: fix a deadlock in ip_ra_control · 1215e51e
      WANG Cong authored 
      Similar to commit 87e9f031
("ipv4: fix a potential deadlock in mcast getsockopt() path"),
there is a deadlock scenario for IP_ROUTER_ALERT too:

       CPU0                    CPU1
       ----                    ----
  lock(rtnl_mutex);
                               lock(sk_lock-AF_INET);
                               lock(rtnl_mutex);
  lock(sk_lock-AF_INET);

Fix this by always locking RTNL first on all setsockopt() paths.

Note, after this patch ip_ra_lock is no longer needed either.
Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
Tested-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1215e51e
    • Bert Kenward's avatar
      sfc: limit the number of receive queues · 271a8b42
      Bert Kenward authored 
      The number of rx queues is determined by the rss_cpus parameter
or the cpu topology. If that is higher than EFX_MAX_RX_QUEUES the
driver can corrupt state.

Fixes: 8ceee660 ("New driver "sfc" for Solarstorm SFC4000 controller.")
Signed-off-by: default avatarBert Kenward <bkenward@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      271a8b42
  9. 16 Apr, 2017 6 commits
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