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

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Message-ID: <689cbddd.050a0220.7f033.0153.GAE@google.com>
Date: Wed, 13 Aug 2025 09:31:25 -0700
From: syzbot <syzbot+b4d960daf7a3c7c2b7b1@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Forwarded: Re: [syzbot] [kvm?] [net?] [virt?] WARNING in virtio_transport_send_pkt_info

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***

Subject: Re: [syzbot] [kvm?] [net?] [virt?] WARNING in virtio_transport_send_pkt_info
Author: mst@...hat.com


#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master


diff --git a/net/core/datagram.c b/net/core/datagram.c
index 94cc4705e91d..3b5695ad3714 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -686,6 +686,11 @@ int zerocopy_fill_skb_from_iter(struct sk_buff *skb,
 		if (refs)
 			page_ref_sub(last_head, refs);
 	}
+
+	/* Fail if we couldn't get all requested data, like linear copy does */
+	if (length > 0)
+		return -EFAULT;
+
 	return 0;
 }