https://github.com/torvalds/linux
Revision a810007afe239d59c1115fcaa06eb5b480f876e9 authored by Sean Rees on 08 February 2017, 22:30:59 UTC, committed by Linus Torvalds on 08 February 2017, 23:41:43 UTC
Commit 210e7a43fa90 ("mm: SLUB freelist randomization") broke USB hub
initialisation as described in

  https://bugzilla.kernel.org/show_bug.cgi?id=177551.

Bail out early from init_cache_random_seq if s->random_seq is already
initialised.  This prevents destroying the previously computed
random_seq offsets later in the function.

If the offsets are destroyed, then shuffle_freelist will truncate
page->freelist to just the first object (orphaning the rest).

Fixes: 210e7a43fa90 ("mm: SLUB freelist randomization")
Link: http://lkml.kernel.org/r/20170207140707.20824-1-sean@erifax.org
Signed-off-by: Sean Rees <sean@erifax.org>
Reported-by: <userwithuid@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Thomas Garnier <thgarnie@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 4d59b6c
History
Tip revision: a810007afe239d59c1115fcaa06eb5b480f876e9 authored by Sean Rees on 08 February 2017, 22:30:59 UTC
mm/slub.c: fix random_seq offset destruction
Tip revision: a810007
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.cocciconfig -rw-r--r-- 59 bytes
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