From nobody Mon Jun 8 22:01:35 2026 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) (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 EBFED3B5837; Tue, 26 May 2026 08:04:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779782652; cv=none; b=PC+11pDW8vNkla+rnsbHIgxCui4Wb9IHmg1b5ObyAVRrCI0mQTWzf1TGRrvG4xErWRNPq54KUbxHlhZiRhZbKGNfcTeg2Ia0zaBew23ZxnIXX7hD/rjnm5y4GlMz28ezY6elFPTRAmA9cH7g2ohYkDuRL4VNCXnqxR+RYX5Tb4U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779782652; c=relaxed/simple; bh=45KEKPvIipfpxvasf0IAIn3DmtzkftZ2hberpVknMjE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=PIHtsW4ISBSMwLQZXTFvCZawiEE3Srgfwb+1ax9DJQ/oGHXY7PxF1W5zoAOm9pUbXSvs0Kn2gsN/gzVM+F5m1XaBJ6rP5liQpfytneEd2Pr34ue0R7YKLzy1Di3wqBhqzTuwmg8bKt8QO39hzxNkeTkifvl3lkEqmNjTZIMxtEM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=IhwxUNh3; arc=none smtp.client-ip=220.197.31.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="IhwxUNh3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=9B rc5GiPYOxWptKHRclEmQdD+ryXnNMxYPoyH4Q3BgA=; b=IhwxUNh3CRcZ2tdxwR 4/orR6AaXzDrJNtlXSiATLbMq+LyMXS4HVbHU/kCsG9P/tBr8jLiUlA+dYb8J1c0 RAe0jl+GL0RWvIo7qy36yPw2BZvG3FCsIfpeybGj9fexDnWU4784nT71ebErqKig bqxP55v4gXY/YhYJILr5A42TY= Received: from localhost.localdomain (unknown []) by gzsmtp3 (Coremail) with SMTP id PigvCgDnL5PbUxVqovnmEg--.27103S2; Tue, 26 May 2026 16:03:43 +0800 (CST) From: "rom.wang" To: "Michael S . Tsirkin" , Jason Wang , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Paolo Abeni , kvm@vger.kernel.org, virtualization@lists.linux.dev Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Yufeng Wang Subject: [PATCH] vhost/net: fix clear_user start address in VHOST_GET_FEATURES_ARRAY Date: Tue, 26 May 2026 16:03:36 +0800 Message-Id: <20260526080336.61296-1-r4o5m6e8o@163.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: PigvCgDnL5PbUxVqovnmEg--.27103S2 X-Coremail-Antispam: 1Uf129KBjvdXoWrKry8tF43WrWkXrW7Wr48Zwb_yoWkXFX_u3 9rXryxuryxGrnI9wsxXa4SyrWayFW8urs7WFn29ryxA343u3Z7Cana9FnxJa1UW3y8CF9r A3s8Jr92g3Z2qjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IU8nXo7UUUUU== X-CM-SenderInfo: 3uurkzkwhy0qqrwthudrp/xtbCzh-rYWoVU9+0-QAA3h Content-Type: text/plain; charset="utf-8" From: Yufeng Wang The clear_user() call in VHOST_GET_FEATURES_ARRAY incorrectly starts at argp, which is the beginning of the features array, overwriting the data just written by copy_to_user(). It should start after the copied elements at argp + copied * sizeof(u64) to only zero the trailing unused space. Fixes: 333c515d1896 ("vhost-net: allow configuring extended features") Signed-off-by: Yufeng Wang --- drivers/vhost/net.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index db341c922673..70c578acf840 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -1777,7 +1777,8 @@ static long vhost_net_ioctl(struct file *f, unsigned = int ioctl, return -EFAULT; =20 /* Zero the trailing space provided by user-space, if any */ - if (clear_user(argp, size_mul(count - copied, sizeof(u64)))) + if (clear_user(argp + copied * sizeof(u64), + size_mul(count - copied, sizeof(u64)))) return -EFAULT; return 0; case VHOST_SET_FEATURES_ARRAY: --=20 2.34.1