linux-kernel - Re: [syzbot] [kvm?] [net?] [virt?] WARNING in virtio_transport_send_pkt

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Message-ID: <tencent_3D2D9ED41B4A4B761B9325A0BA93BB2D3308@qq.com>
Date: Fri, 28 Nov 2025 12:34:35 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+28e5f3d207b14bae122a@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kvm?] [net?] [virt?] WARNING in virtio_transport_send_pkt_info (2)

#syz test


diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index dcc8a1d5851e..511aa5ceeaca 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -55,7 +55,7 @@ static bool virtio_transport_can_zcopy(const struct virtio_transport *t_ops,
 		return false;
 
 	/* We can't send whole iov. */
-	if (iov_iter->count > pkt_len)
+	if (!iov_iter->count || iov_iter->count > pkt_len)
 		return false;
 
 	/* Check that transport can send data in zerocopy mode. */