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Subject[PATCH] amso1100: Add check if cache memory was allocated before freeing it
Date
From: Svetlana Mavrina <another.karnil@gmail.com>

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>
---
drivers/infiniband/hw/amso1100/c2_intr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/amso1100/c2_intr.c b/drivers/infiniband/hw/amso1100/c2_intr.c
index 8951db4ae29d..3a17d9b36dba 100644
--- a/drivers/infiniband/hw/amso1100/c2_intr.c
+++ b/drivers/infiniband/hw/amso1100/c2_intr.c
@@ -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;
}
--
1.8.1.2


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