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| author | Jason Wang <jasowang@redhat.com> | 2025-07-14 16:47:53 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-20 18:30:40 +0200 |
| commit | a1a63d8a442d09ccc38af1618391f626c4fa0c49 (patch) | |
| tree | c97953c261df6138789367dfc1c93b1db073821b | |
| parent | 680c7d9d919773565278e9daca13c2af62098060 (diff) | |
vhost: fail early when __vhost_add_used() fails
[ Upstream commit b4ba1207d45adaafa2982c035898b36af2d3e518 ]
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>
| -rw-r--r-- | drivers/vhost/vhost.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 79b0b7cd2860..71604668e53f 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2971,6 +2971,9 @@ 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)) { |