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RDMA/amso1100: Add check if cache memory was allocated before freeing it

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There is a path in handle_vq() where kmem_cache_free() can be called
with pointer to a local variable.  It can happen if vq_repbuf_alloc()
failed to allocate memory from cache and req is NULL.

The patch adds check if cache memory was allocated before freeing it.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Svetlana Mavrina <another.karnil@gmail.com>
Reviewed-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Svetlana Mavrina 2014-01-12 11:56:09 +00:00 committed by Roland Dreier
parent 05633102d8
commit d9d5713ca6
1 changed files with 2 additions and 1 deletions
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3
drivers/infiniband/hw/amso1100/c2_intr.c
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@ -169,7 +169,8 @@ static void handle_vq(struct c2_dev *c2dev, u32 mq_index)
* We should never get here, as the adapter should
* never send us a reply that we're not expecting.
*/
vq_repbuf_free(c2dev, host_msg);
if (reply_msg != NULL)
vq_repbuf_free(c2dev, host_msg);
pr_debug("handle_vq: UNEXPECTEDLY got NULL req\n");
return;
}