The patch titled
Subject: mm/mempool: allow NULL `pool' pointer in mempool_destroy()
has been removed from the -mm tree. Its filename was
mm-mempool-allow-null-pool-pointer-in-mempool_destroy.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Subject: mm/mempool: allow NULL `pool' pointer in mempool_destroy()
mempool_destroy() does not tolerate a NULL mempool_t pointer argument and
performs a NULL-pointer dereference. This requires additional attention
and effort from developers/reviewers and forces all mempool_destroy()
callers to do a NULL check
if (pool)
mempool_destroy(pool);
Or, otherwise, be invalid mempool_destroy() users.
Tweak mempool_destroy() and NULL-check the pointer there.
Proposed by Andrew Morton.
Link: https://lkml.org/lkml/2015/6/8/583
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempool.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/mempool.c~mm-mempool-allow-null-pool-pointer-in-mempool_destroy mm/mempool.c
--- a/mm/mempool.c~mm-mempool-allow-null-pool-pointer-in-mempool_destroy
+++ a/mm/mempool.c
@@ -150,6 +150,9 @@ static void *remove_element(mempool_t *p
*/
void mempool_destroy(mempool_t *pool)
{
+ if (unlikely(!pool))
+ return;
+
while (pool->curr_nr) {
void *element = remove_element(pool);
pool->free(element, pool->pool_data);
_
Patches currently in -mm which might be from sergey.senozhatsky@xxxxxxxxx are
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