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authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2015-09-08 15:00:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 15:35:28 -0700
commit4e3ca3e033d1eea62fa16c3fdbef4f20427bd0de (patch)
tree34ff5ce0159e781d1b8ca208ff827e53d37545a8
parent3942d29918522ba6a393c19388301ec04df429cd (diff)
downloadop-kernel-dev-4e3ca3e033d1eea62fa16c3fdbef4f20427bd0de.zip
op-kernel-dev-4e3ca3e033d1eea62fa16c3fdbef4f20427bd0de.tar.gz
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@gmail.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mempool.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mempool.c b/mm/mempool.c
index 2cc08de..4c533bc 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -150,6 +150,9 @@ static void *remove_element(mempool_t *pool)
*/
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);
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