From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out203-205-221-235.mail.qq.com (out203-205-221-235.mail.qq.com [203.205.221.235]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C8CA9134CF for ; Fri, 28 Nov 2025 08:09:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.205.221.235 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764317383; cv=none; b=TLpGTsj0NF9nvaZHxWgLJf4zoI/9aHtqD+eNgc2i1ANNURwXpJPpojE72kJN+ipAe7KyiwBVeuL/Zo2zQzXJ315YKp7HiOYfiVprJSM4D0l37P68JX/mN0TvgBku7JqFVnxCEhoc4RYTjHN2sEo6Up82QsvF/MTCNElrpYmTvls= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764317383; c=relaxed/simple; bh=8tmFeVECL/QF6gmSHlSBcNZ7k1ufWSNM+qDPoFFX5fM=; h=Message-ID:From:To:Cc:Subject:Date:In-Reply-To:References: MIME-Version; b=fK2kCEP7dK/OY48KXo92evjyX26Hix3MAGjkZ/D7NRzqHFn2Gh63EnLrHqLpDbqFKs3w2ofYRos+w/uygFlLwYgyVYHsrWkUNZpIqeXczm3NT2ozTuNF+oP/8fZl+tHQBgZnwSLIizLbqM1P17AusJ4zhtfQCuihGuTUxWLPbJ0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com; spf=pass smtp.mailfrom=qq.com; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b=rUXasUat; arc=none smtp.client-ip=203.205.221.235 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qq.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b="rUXasUat" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qq.com; s=s201512; t=1764317377; bh=IjyTE+PcYR4Ish/KyT9hQ0fpgpfYE8RtSW1Os5Tzl3w=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rUXasUatOr2mDqBUr8/VShSC08ENbXQN8ow0JvIl6hM43ldMKzsEfJsdWT0HvykU+ fdcEcbRZ7dI/U3kp1lhCiZRW6kRkG/F7DlF1GfhUQpJZ+4j0HAraU6Wiwhm7qUR6kK ff74dgv83+Eo5GHSZ8OoyWYCas8LKahqc5RyY0vs= Received: from lxu-ped-host.. ([111.201.7.117]) by newxmesmtplogicsvrsza63-0.qq.com (NewEsmtp) with SMTP id 263B7C17; Fri, 28 Nov 2025 16:09:35 +0800 X-QQ-mid: xmsmtpt1764317375tz1hyxy4u Message-ID: X-QQ-XMAILINFO: OVFdYp27KdlJJSqvsllqZMwAC5DDMZhK60bERU4TQYzvF8tiSGNlb0nnRvDhaC Ts2xEL4ykDDvgIYujJ8yCU4kASQ7wFLBQPJQ1+jaxCeuX90ipnocUYBDRBZs1nVtHYLecXclBoOi wNI1A3AbDTSL4MH1j/JEaY7rx3dIraz4/7KJhL63tjncvT+w0dR7lA8yQSkhlOE0T72b//FYFPNw ZbyWlWi3xMBU6R8cUBswC/O0Ed7fLDsj3GIOf9Oio7SQD1K2FSQ6SZjm5klc0XeFsknW4bsLk0Tq p8H9AVbYzrUv4A6Az+I8tijWf/1OR40J+lUCUsJYJOX0b2YDlSzmZqBspnBCvxDORJ55C80Jcbp0 JlT8Tp4PpHNcFA695fTRHOCF1/2ULznSmo786WVEZAE++lmpAWFzW6X6DzAsMi3DLF5Igw1MYssQ 6olZutYVIyYofxSgSITIk36SzDjBev/I+MV49hfLVt5xQSkswQnf0eH1r9lMM7wNE+w8Lw+UTtWN 47uYIDeHV50eG/1tV+QfMCDNWff6YbfsHrwQgVlKYtWTVTultulVd+cIdO7aO0jDhp6TbqEhLJKb XzO9U+mMa4uXWPFl0f8/V+XIp+QESo/PXSo3BpUPx4XOJ+puM2amyctPh45PuMRo5TAc18D2KmhI c+/smePouMvIoIoVBe0GMwR9j9KpZnGQWXN67gGbCfZucKySkP6sWCOd2snMp8rJhdGR7nvMAIEu TAjU2DgKaTCOdld/QDybKn1eXEIEKvcbTYyxzczC2Ucy5I3z27qMrl6BRMj/YwQkEbJELz3q96SJ dPpCRbVuP4f8WxEb3At0aRDHaVMODhMn7mXs5RW618cp4MI7vSUqQaapL2POqot6TXTZPq/UUPj9 T51it1EYGL7e81k257/Pj9Y5mScYzCGullW/qkCrhvNFMuKm2tY8/3HUBcquZrxFuxQwCeAQ0GBA J96bqgrEOK/yX/EJthcrBfgKBjBioDXwV5WI1rSZJUlYOFAtQHCLYbDhY9mV1sScIN6nd+4Vy+E4 XYREoMHe/lIylX3u+5sNpBlNww+mQ= X-QQ-XMRINFO: OWPUhxQsoeAVDbp3OJHYyFg= From: Edward Adam Davis To: syzbot+28e5f3d207b14bae122a@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [kvm?] [net?] [virt?] WARNING in virtio_transport_send_pkt_info (2) Date: Fri, 28 Nov 2025 16:09:36 +0800 X-OQ-MSGID: <20251128080935.108454-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <6928fe78.a70a0220.d98e3.012a.GAE@google.com> References: <6928fe78.a70a0220.d98e3.012a.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test diff --git a/net/core/datagram.c b/net/core/datagram.c index c285c6465923..da10465cd8a4 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -748,10 +748,13 @@ int __zerocopy_sg_from_iter(struct msghdr *msg, struct sock *sk, size_t length, struct net_devmem_dmabuf_binding *binding) { + struct iov_iter_state state; unsigned long orig_size = skb->truesize; unsigned long truesize; int ret; + iov_iter_save_state(from, &state); + if (msg && msg->msg_ubuf && msg->sg_from_iter) ret = msg->sg_from_iter(skb, from, length); else if (binding) @@ -759,6 +762,9 @@ int __zerocopy_sg_from_iter(struct msghdr *msg, struct sock *sk, else ret = zerocopy_fill_skb_from_iter(skb, from, length); + if (ret) + iov_iter_restore(from, &state); + truesize = skb->truesize - orig_size; if (sk && sk->sk_type == SOCK_STREAM) { sk_wmem_queued_add(sk, truesize);