tree 4d8dc1df9af9c7aacdc2a049382df61c4660b476
parent 4e3ca3e033d1eea62fa16c3fdbef4f20427bd0de
author Sergey Senozhatsky <sergey.senozhatsky@gmail.com> 1441749656 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1441751728 -0700

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@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>