From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4015317ADF6; Sun, 24 Mar 2024 22:40:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711320031; cv=none; b=OgklmFEm1YsMOaWGEB32FtCmO92gFcTWxATOTgvmoGctXWqRIUdPTWver6jD1BsgxkLSwp2QL1MMIbSss/gVF2vavwAvvsutO+STZXYxq03CL3IqfI9fWTkyPDzyCNGE4ZH43G97ilFJ+6Id4K/ojvHtV4GKwbJzeO3bt51/QmI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711320031; c=relaxed/simple; bh=OQsM+h49KmJCuY/Vc4xjJEjsD2hIGGvvSko+Q3j56jk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TL4C4y2Au/FwgTgGWTPFdKcXvtvxZPg4uOy0rpPB6UsdrQh2N3AxTb1GdZkoVIYtcOL/x3ftnIGXuG6flDCbBcLVUUhizIFC/Oxnx3RJmncXuJN3M8TpYUv6p65xVdcKpnolClvv0gRg/QniH/1s99rO2LgTgCHG477ZL2A1mgY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aYULRwlJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aYULRwlJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66660C43399; Sun, 24 Mar 2024 22:40:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711320031; bh=OQsM+h49KmJCuY/Vc4xjJEjsD2hIGGvvSko+Q3j56jk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aYULRwlJ/djr+dv4WDo+TDKpLcYJ0GvckMxx/YYGjUh2gEh33KoOOnG7lO/YlZijO pn6IPfDIhvWvDmqZm6qZ0+7U3nQ+e37bUCAV/kXKv18pvA6Ae+y22zKO49SQaGkgER kDX2n77/BTzE+wZqqkJ1kPXB7fGO0iQCheRK/25kXldCBUXKCDj4U/sArXqI+hrdrs IaqEqk7cRamQubfvC7zITvvg5e95yr7pALaNuKVQayjHumgNHJVCaVRLsslX0tmf8F Q8QvtBkXcjLwkdi9k0L+FLCibGc7sAnmBDs02wzwnOb++cLEqU+0NZk6er6+Ktpck8 4XVm6UU4iOkoQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Gavrilov Ilia , Tom Parkin , "David S . Miller" , Sasha Levin Subject: [PATCH 6.8 339/715] l2tp: fix incorrect parameter validation in the pppol2tp_getsockopt() function Date: Sun, 24 Mar 2024 18:28:38 -0400 Message-ID: <20240324223455.1342824-340-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324223455.1342824-1-sashal@kernel.org> References: <20240324223455.1342824-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Gavrilov Ilia [ Upstream commit 955e9876ba4ee26eeaab1b13517f5b2c88e73d55 ] The 'len' variable can't be negative when assigned the result of 'min_t' because all 'min_t' parameters are cast to unsigned int, and then the minimum one is chosen. To fix the logic, check 'len' as read from 'optlen', where the types of relevant variables are (signed) int. Fixes: 3557baabf280 ("[L2TP]: PPP over L2TP driver core") Reviewed-by: Tom Parkin Signed-off-by: Gavrilov Ilia Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/l2tp/l2tp_ppp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index f011af6601c9c..6146e4e67bbb5 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -1356,11 +1356,11 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, if (get_user(len, optlen)) return -EFAULT; - len = min_t(unsigned int, len, sizeof(int)); - if (len < 0) return -EINVAL; + len = min_t(unsigned int, len, sizeof(int)); + err = -ENOTCONN; if (!sk->sk_user_data) goto end; -- 2.43.0