• Vegard Nossum's avatar
    rhashtable: fix shift by 64 when shrinking · 12311959
    Vegard Nossum authored
    I got this:
    
        ================================================================================
        UBSAN: Undefined behaviour in ./include/linux/log2.h:63:13
        shift exponent 64 is too large for 64-bit type 'long unsigned int'
        CPU: 1 PID: 721 Comm: kworker/1:1 Not tainted 4.8.0-rc1+ #87
        Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
        Workqueue: events rht_deferred_worker
         0000000000000000 ffff88011661f8d8 ffffffff82344f50 0000000041b58ab3
         ffffffff84f98000 ffffffff82344ea4 ffff88011661f900 ffff88011661f8b0
         0000000000000001 ffff88011661f6b8 dffffc0000000000 ffffffff867f7640
        Call Trace:
         [<ffffffff82344f50>] dump_stack+0xac/0xfc
         [<ffffffff82344ea4>] ? _atomic_dec_and_lock+0xc4/0xc4
         [<ffffffff8242f5b8>] ubsan_epilogue+0xd/0x8a
         [<ffffffff82430c41>] __ubsan_handle_shift_out_of_bounds+0x255/0x29a
         [<ffffffff824309ec>] ? __ubsan_handle_out_of_bounds+0x180/0x180
         [<ffffffff84003436>] ? nl80211_req_set_reg+0x256/0x2f0
         [<ffffffff812112ba>] ? print_context_stack+0x8a/0x160
         [<ffffffff81200031>] ? amd_pmu_reset+0x341/0x380
         [<ffffffff823af808>] rht_deferred_worker+0x1618/0x1790
         [<ffffffff823af808>] ? rht_deferred_worker+0x1618/0x1790
         [<ffffffff823ae1f0>] ? rhashtable_jhash2+0x370/0x370
         [<ffffffff8134c12d>] ? process_one_work+0x6fd/0x1970
         [<ffffffff8134c1cf>] process_one_work+0x79f/0x1970
         [<ffffffff8134c12d>] ? process_one_work+0x6fd/0x1970
         [<ffffffff8134ba30>] ? try_to_grab_pending+0x4c0/0x4c0
         [<ffffffff8134d564>] ? worker_thread+0x1c4/0x1340
         [<ffffffff8134d8ff>] worker_thread+0x55f/0x1340
         [<ffffffff845e904f>] ? __schedule+0x4df/0x1d40
         [<ffffffff8134d3a0>] ? process_one_work+0x1970/0x1970
         [<ffffffff8134d3a0>] ? process_one_work+0x1970/0x1970
         [<ffffffff813642f7>] kthread+0x237/0x390
         [<ffffffff813640c0>] ? __kthread_parkme+0x280/0x280
         [<ffffffff845f8c93>] ? _raw_spin_unlock_irq+0x33/0x50
         [<ffffffff845f95df>] ret_from_fork+0x1f/0x40
         [<ffffffff813640c0>] ? __kthread_parkme+0x280/0x280
        ================================================================================
    
    roundup_pow_of_two() is undefined when called with an argument of 0, so
    let's avoid the call and just fall back to ht->p.min_size (which should
    never be smaller than HASH_MIN_SIZE).
    
    Cc: Herbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: default avatarVegard Nossum <vegard.nossum@oracle.com>
    Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    12311959
rhashtable.c 20.8 KB