Messages in this thread Patch in this message | | | Subject | [PATCH] lib/list_sort: do not pass bad pointers to cmp callback | From | Artem Bityutskiy <> | Date | Sat, 21 Aug 2010 13:06:22 +0300 |
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From: Don Mullis <don.mullis@gmail.com>
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. This patch fixes the issue.
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 --- 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 4b5cb79..a7616fa 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; -- 1.7.1.1
-- Best Regards, Artem Bityutskiy (Артём Битюцкий)
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