From: Weimin Xiong <xiongwm2026@163.com>
To: virtualization@lists.linux.dev
Cc: mst@redhat.com, jasowangio@gmail.com, eperezma@redhat.com,
netdev@vger.kernel.org, xiongweimin <xiongweimin@kylinos.cn>
Subject: [PATCH] vhost: reject zero-size IOTLB INVALIDATE
Date: Thu, 16 Jul 2026 11:00:26 +0800 [thread overview]
Message-ID: <20260716030026.123733-1-xiongwm2026@163.com> (raw)
From: xiongweimin <xiongweimin@kylinos.cn>
Reject VHOST_IOTLB_INVALIDATE messages with size == 0 to prevent
iova + size - 1 from underflowing to U64_MAX, which would
incorrectly delete the entire IOTLB.
Signed-off-by: xiongweimin <xiongweimin@kylinos.cn>
---
drivers/vhost/vhost.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 3c080c454e374cabd7321416ed92c5f7d3135254..xxxxxxxxxx 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1656,6 +1656,10 @@ static int vhost_process_iotlb_msg(struct vhost_dev *dev, u32 asid,
if (!dev->iotlb) {
ret = -EFAULT;
break;
+ }
+ if (!msg->size) {
+ ret = -EINVAL;
+ break;
}
vhost_vq_meta_reset(dev);
vhost_iotlb_del_range(dev->iotlb, msg->iova,
--
2.39.3
next reply other threads:[~2026-07-16 3:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-16 3:00 Weimin Xiong [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-07-16 3:02 [PATCH] vhost: reject zero-size IOTLB INVALIDATE Weimin Xiong
2026-07-16 9:41 ` Eugenio Perez Martin
2026-07-17 1:29 ` Weimin Xiong
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