[PATCH 5.1 42/46] virtio_ring: Fix potential mem leak in virtqueue_add_indirect_packed

[Greg Kroah-Hartman]

From: YueHaibing <yuehaib...@huawei.com>

commit df0bfe7501e9319546ea380d39674a4179e059c3 upstream.

'desc' should be freed before leaving from err handing path.

Fixes: 1ce9e6055fa0 ("virtio_ring: introduce packed ring support")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Acked-by: Jason Wang <jasow...@redhat.com>
sta...@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/virtio/virtio_ring.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1004,6 +1004,7 @@ static int virtqueue_add_indirect_packed
 
        if (unlikely(vq->vq.num_free < 1)) {
                pr_debug("Can't add buf len 1 - avail = 0\n");
+               kfree(desc);
                END_USE(vq);
                return -ENOSPC;
        }