• J. Bruce Fields's avatar
    lockd: fix rpcbind crash on lockd startup failure · f12342b1
    J. Bruce Fields authored
    commit 7c17705e upstream.
    
    Nikita Yuschenko reported that booting a kernel with init=/bin/sh and
    then nfs mounting without portmap or rpcbind running using a busybox
    mount resulted in:
    
      # mount -t nfs 10.30.130.21:/opt /mnt
      svc: failed to register lockdv1 RPC service (errno 111).
      lockd_up: makesock failed, error=-111
      Unable to handle kernel paging request for data at address 0x00000030
      Faulting instruction address: 0xc055e65c
      Oops: Kernel access of bad area, sig: 11 [#1]
      MPC85xx CDS
      Modules linked in:
      CPU: 0 PID: 1338 Comm: mount Not tainted 3.10.44.cge #117
      task: cf29cea0 ti: cf35c000 task.ti: cf35c000
      NIP: c055e65c LR: c0566490 CTR: c055e648
      REGS: cf35dad0 TRAP: 0300   Not tainted  (3.10.44.cge)
      MSR: 00029000 <CE,EE,ME>  CR: 22442488  XER: 20000000
      DEAR: 00000030, ESR: 00000000
    
      GPR00: c05606f4 cf35db80 cf29cea0 cf0ded80 cf0dedb8 00000001 1dec3086
      00000000
      GPR08: 00000000 c07b1640 00000007 1dec3086 22442482 100b9758 00000000
      10090ae8
      GPR16: 00000000 000186a5 00000000 00000000 100c3018 bfa46edc 100b0000
      bfa46ef0
      GPR24: cf386ae0 c07834f0 00000000 c0565f88 00000001 cf0dedb8 00000000
      cf0ded80
      NIP [c055e65c] call_start+0x14/0x34
      LR [c0566490] __rpc_execute+0x70/0x250
      Call Trace:
      [cf35db80] [00000080] 0x80 (unreliable)
      [cf35dbb0] [c05606f4] rpc_run_task+0x9c/0xc4
      [cf35dbc0] [c0560840] rpc_call_sync+0x50/0xb8
      [cf35dbf0] [c056ee90] rpcb_register_call+0x54/0x84
      [cf35dc10] [c056f24c] rpcb_register+0xf8/0x10c
      [cf35dc70] [c0569e18] svc_unregister.isra.23+0x100/0x108
      [cf35dc90] [c0569e38] svc_rpcb_cleanup+0x18/0x30
      [cf35dca0] [c0198c5c] lockd_up+0x1dc/0x2e0
      [cf35dcd0] [c0195348] nlmclnt_init+0x2c/0xc8
      [cf35dcf0] [c015bb5c] nfs_start_lockd+0x98/0xec
      [cf35dd20] [c015ce6c] nfs_create_server+0x1e8/0x3f4
      [cf35dd90] [c0171590] nfs3_create_server+0x10/0x44
      [cf35dda0] [c016528c] nfs_try_mount+0x158/0x1e4
      [cf35de20] [c01670d0] nfs_fs_mount+0x434/0x8c8
      [cf35de70] [c00cd3bc] mount_fs+0x20/0xbc
      [cf35de90] [c00e4f88] vfs_kern_mount+0x50/0x104
      [cf35dec0] [c00e6e0c] do_mount+0x1d0/0x8e0
      [cf35df10] [c00e75ac] SyS_mount+0x90/0xd0
      [cf35df40] [c000ccf4] ret_from_syscall+0x0/0x3c
    
    The addition of svc_shutdown_net() resulted in two calls to
    svc_rpcb_cleanup(); the second is no longer necessary and crashes when
    it calls rpcb_register_call with clnt=NULL.
    Reported-by: default avatarNikita Yushchenko <nyushchenko@dev.rtsoft.ru>
    Fixes: 679b033d "lockd: ensure we tear down any live sockets when socket creation fails during lockd_up"
    Acked-by: default avatarJeff Layton <jlayton@primarydata.com>
    Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    f12342b1
svc.c 15.6 KB