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

[Greg Kroah-Hartman]

From: YueHaibing <yuehaibing@xxxxxxxxxx>

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 <yuehaibing@xxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 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;
 	}