https://github.com/torvalds/linux
Revision ecccd1248d6e6986130ffcc3b0d003cb46a485c0 authored by Zlatko Calusic on 28 December 2012, 02:16:38 UTC, committed by Linus Torvalds on 28 December 2012, 16:42:39 UTC
An unintended consequence of commit 4ae0a48b5efc ("mm: modify
pgdat_balanced() so that it also handles order-0") is that
wait_iff_congested() can now be called with NULL 'struct zone *'
producing kernel oops like this:

  BUG: unable to handle kernel NULL pointer dereference
  IP: [<ffffffff811542d9>] wait_iff_congested+0x59/0x140

This trivial patch fixes it.

Reported-by: Zhouping Liu <zliu@redhat.com>
Reported-and-tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Zlatko Calusic <zlatko.calusic@iskon.hr>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 101e5c7
History
Tip revision: ecccd1248d6e6986130ffcc3b0d003cb46a485c0 authored by Zlatko Calusic on 28 December 2012, 02:16:38 UTC
mm: fix null pointer dereference in wait_iff_congested()
Tip revision: ecccd12
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