linux-kernel - [PATCH 5.1 42/46] virtio_ring: Fix potential mem leak in virtqueue_add_indirect

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Message-Id: <20190515090628.890546862@linuxfoundation.org>
Date:   Wed, 15 May 2019 12:57:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, YueHaibing <yuehaibing@...wei.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Subject: [PATCH 5.1 42/46] virtio_ring: Fix potential mem leak in virtqueue_add_indirect_packed

From: YueHaibing <yuehaibing@...wei.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 <yuehaibing@...wei.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Acked-by: Jason Wang <jasowang@...hat.com>
stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 	}