The patch titled
Subject: mm/dmapool: allow NULL `pool' pointer in dma_pool_destroy()
has been removed from the -mm tree. Its filename was
mm-dmapool-allow-null-pool-pointer-in-dma_pool_destroy.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Subject: mm/dmapool: allow NULL `pool' pointer in dma_pool_destroy()
dma_pool_destroy() does not tolerate a NULL dma_pool pointer argument and
performs a NULL-pointer dereference. This requires additional attention
and effort from developers/reviewers and forces all dma_pool_destroy()
callers to do a NULL check
if (pool)
dma_pool_destroy(pool);
Or, otherwise, be invalid dma_pool_destroy() users.
Tweak dma_pool_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/dmapool.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/dmapool.c~mm-dmapool-allow-null-pool-pointer-in-dma_pool_destroy mm/dmapool.c
--- a/mm/dmapool.c~mm-dmapool-allow-null-pool-pointer-in-dma_pool_destroy
+++ a/mm/dmapool.c
@@ -271,6 +271,9 @@ void dma_pool_destroy(struct dma_pool *p
{
bool empty = false;
+ if (unlikely(!pool))
+ return;
+
mutex_lock(&pools_reg_lock);
mutex_lock(&pools_lock);
list_del(&pool->pools);
_
Patches currently in -mm which might be from sergey.senozhatsky@xxxxxxxxx are
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