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vhost: reject backend enable without a kick file

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Enabling a backend without VHOST_SET_VRING_KICK dereferences a NULL
vq->kick in vhost_poll_start(). Reject the request with -EINVAL.

Fixes: 264ee5aa81 ("tools/virtio: Add --reset")
Assisted-by: OpenAI-Codex:GPT-5.6
Signed-off-by: Linfeng Sun <linfeng.sun.dev@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20261011-fix-null-pointer-in-vhost_test_set_backend-v1-1-60b2f12d64c6@gmail.com>
This commit is contained in:
Linfeng Sun 2026-10-11 15:33:30 +08:00 committed by Michael S. Tsirkin
parent a543346b96
commit 509f6bd229
1 changed files with 4 additions and 0 deletions
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4
drivers/vhost/test.c
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@ -287,6 +287,10 @@ static long vhost_test_set_backend(struct vhost_test *n, unsigned index, int fd)
r = -EFAULT;
goto err_vq;
}
if (enable && !vq->kick) {
r = -EINVAL;
goto err_vq;
}
if (!enable) {
vhost_poll_stop(&vq->poll);
backend = vhost_vq_get_backend(vq);