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vhost: fail early when __vhost_add_used() fails

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[ Upstream commit b4ba1207d4 ]

This patch fails vhost_add_used_n() early when __vhost_add_used()
fails to make sure used idx is not updated with stale used ring
information.

Reported-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20250714084755.11921-2-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jason Wang 2025-07-14 16:47:53 +08:00 committed by Greg Kroah-Hartman
parent 07813354bb
commit f4fd71854b
1 changed files with 3 additions and 0 deletions
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3
drivers/vhost/vhost.c
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@ -2983,6 +2983,9 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads,
}
r = __vhost_add_used_n(vq, heads, count);
if (r < 0)
return r;
/* Make sure buffer is written before we update index. */
smp_wmb();
if (vhost_put_used_idx(vq)) {