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Message-Id: <20231211142505.4076725-1-kniv@yandex-team.ru>
Date: Mon, 11 Dec 2023 17:25:05 +0300
From: Nikolay Kuratov <kniv@...dex-team.ru>
To: linux-kernel@...r.kernel.org
Cc: sgarzare@...hat.com,
netdev@...r.kernel.org,
virtualization@...ts.linux.dev,
kvm@...r.kernel.org,
Nikolay Kuratov <kniv@...dex-team.ru>
Subject: [PATCH] vsock/virtio: Fix unsigned integer wrap around in virtio_transport_has_space()
We need to do signed arithmetic if we expect condition
`if (bytes < 0)` to be possible
Found by Linux Verification Center (linuxtesting.org) with SVACE
Signed-off-by: Nikolay Kuratov <kniv@...dex-team.ru>
---
net/vmw_vsock/virtio_transport_common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index c8e162c9d1df..6df246b53260 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -843,7 +843,7 @@ static s64 virtio_transport_has_space(struct vsock_sock *vsk)
struct virtio_vsock_sock *vvs = vsk->trans;
s64 bytes;
- bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
+ bytes = (s64)vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
if (bytes < 0)
bytes = 0;
--
2.34.1
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