diff options
| author | Don Mullis <don.mullis@gmail.com> | 2010-09-30 15:15:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-01 10:50:58 -0700 |
| commit | f015ac3edd84ad72f88e08a4d83c56c360aae404 (patch) | |
| tree | 87f88c4e502d69752776dd36451d0ece5416f9f1 | |
| parent | 982f7c2b2e6a28f8f266e075d92e19c0dd4c6e56 (diff) | |
lib/list_sort: do not pass bad pointers to cmp callback
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>
| -rw-r--r-- | lib/list_sort.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/list_sort.c b/lib/list_sort.c index 4b5cb794c38..a7616fa3162 100644 --- a/lib/list_sort.c +++ b/lib/list_sort.c @@ -70,7 +70,7 @@ static void merge_and_restore_back_links(void *priv, * element comparison is needed, so the client's cmp() * routine can invoke cond_resched() periodically. */ - (*cmp)(priv, tail, tail); + (*cmp)(priv, tail->next, tail->next); tail->next->prev = tail; tail = tail->next; |