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lib/list_sort: do not pass bad pointers to cmp callback

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If the original list is a POT in length, the first callback from line 73
will pass a==b both pointing to the original list_head.  This is dangerous
because the 'list_sort()' user can use 'container_of()' and accesses the
"containing" object, which does not necessary exist for the list head.  So
the user can access RAM which does not belong to him.  If this is a write
access, we can end up with memory corruption.

Signed-off-by: Don Mullis <don.mullis@gmail.com>
Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Don Mullis 2010-09-30 15:15:32 -07:00 committed by Linus Torvalds
parent 982f7c2b2e
commit f015ac3edd
1 changed files with 1 additions and 1 deletions
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lib/list_sort.c
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@ -70,7 +70,7 @@ static void merge_and_restore_back_links(void *priv,
* element comparison is needed, so the client's cmp() * element comparison is needed, so the client's cmp()
* routine can invoke cond_resched() periodically. * routine can invoke cond_resched() periodically.
*/ */
(*cmp)(priv, tail, tail); (*cmp)(priv, tail->next, tail->next);
tail->next->prev = tail; tail->next->prev = tail;
tail = tail->next; tail = tail->next;