4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Matthew Dawson <[email protected]> commit 7640131032db9118a78af715ac77ba2debeeb17c upstream. When removing an element from the mempool, mark it as unpoisoned in KASAN before verifying its contents for SLUB/SLAB debugging. Otherwise KASAN will flag the reads checking the element use-after-free writes as use-after-free reads. Signed-off-by: Matthew Dawson <[email protected]> Acked-by: Andrey Ryabinin <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Cc: Andrii Bordunov <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- mm/mempool.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/mempool.c +++ b/mm/mempool.c @@ -135,8 +135,8 @@ static void *remove_element(mempool_t *p void *element = pool->elements[--pool->curr_nr]; BUG_ON(pool->curr_nr < 0); - check_element(pool, element); kasan_unpoison_element(pool, element); + check_element(pool, element); return element; }
