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virtio: fix memory leak in virtqueue_add()

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When using the indirect buffers feature, 'desc' is allocated in
virtqueue_add() but isn't freed before leaving on a ring full error,
causing a memory leak.

For example, it seems rather clear that this can trigger
with virtio net if mergeable buffers are not used.

Cc: stable@vger.kernel.org
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Wei Yongjun 2016-08-02 14:16:31 +00:00 committed by Michael S. Tsirkin
parent 29b4817d40
commit 58625edf9e
1 changed files with 2 additions and 0 deletions
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2
drivers/virtio/virtio_ring.c
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@ -327,6 +327,8 @@ static inline int virtqueue_add(struct virtqueue *_vq,
* host should service the ring ASAP. */
if (out_sgs)
vq->notify(&vq->vq);
if (indirect)
kfree(desc);
END_USE(vq);
return -ENOSPC;
}