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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

Fixes: 06a8fc7836 ("VSOCK: Introduce virtio_vsock_common.ko")
Signed-off-by: Nikolay Kuratov <kniv@yandex-team.ru>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20231211162317.4116625-1-kniv@yandex-team.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nikolay Kuratov 2023-12-11 19:23:17 +03:00 committed by Jakub Kicinski
parent 9702817384
commit 60316d7f10
1 changed files with 1 additions and 1 deletions
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2
net/vmw_vsock/virtio_transport_common.c
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@ -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;