From b8e7797c11e5121d738b8c468ee08f3411474d1c Mon Sep 17 00:00:00 2001
From: Olivier Matz <[email protected]>
Date: Thu, 28 Nov 2024 12:09:56 +0100
Subject: net/virtio: fix Rx checksum calculation

If hdr->csum_start is larger than packet length, the len argument passed
to rte_raw_cksum_mbuf() overflows and causes a segmentation fault.

Ignore checksum computation in this case.

CVE-2024-11614

Fixes: ca7036b4af3a ("vhost: fix offload flags in Rx path")
Signed-off-by: Maxime Gouin <[email protected]>
Signed-off-by: Olivier Matz <[email protected]>
Reviewed-by: Maxime Coquelin <[email protected]>
---
 lib/vhost/virtio_net.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
index 5ec89719c6..49c2052eba 100644
--- a/lib/vhost/virtio_net.c
+++ b/lib/vhost/virtio_net.c
@@ -2831,6 +2831,9 @@ vhost_dequeue_offload(struct virtio_net *dev, struct virtio_net_hdr *hdr,
 			 */
 			uint16_t csum = 0, off;
 
+			if (hdr->csum_start >= rte_pktmbuf_pkt_len(m))
+				return;
+
 			if (rte_raw_cksum_mbuf(m, hdr->csum_start,
 					rte_pktmbuf_pkt_len(m) - hdr->csum_start, &csum) < 0)
 				return;
-- 
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