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 98ACE1AD41F; Mon, 23 Dec 2024 16:11:40 +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=1734970300; cv=none; b=pQiqHcbybXb/lUSDc8lyz/7BU6znguL8Eh7BGNzrox9suAbe/Opx490CNqluLheOhNDunJyx0LlXWZjWpFNx+h1tuY3R7opekGFA8ID/dz5PlaO0RXPl9k6a/AaOlViw8lPYzFqAgk+a7NUq7lKSZ711QEQd0KMzYQmzQ9B2xmM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734970300; c=relaxed/simple; bh=NzbjC5BaBJf7bhcqYmdTgfwf5sZcXhTK7BEUNfo9i14=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=A5uuvLN6cNlWPWu4GgohZqm7S7mgOARQTW206NyrZ/CxIUajTcBc3maKnpRbNflwaURrSuFgSNtid3f5PUxDS+0fZzGwQSPhiFJRt842r3dAwAJsKwo/cfC8nYJ9SFhTl2ugq2Ppo+RRXLGEiYek0DITGLxU6qLqBdjAWpnvJJE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QMno+2D+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QMno+2D+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0096C4CED3; Mon, 23 Dec 2024 16:11:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734970300; bh=NzbjC5BaBJf7bhcqYmdTgfwf5sZcXhTK7BEUNfo9i14=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QMno+2D+F4TK8y9x/0I1SA7Fv2h0L00EvFzltg1IIBQbYWIizAp5BV8wKnyjQzJ99 99/t8HHoLK46TZd+Vs1Wk2OeGINQwr9zNg8LrWKFFGREF1g4vspHl0v/vYjrvAVR2o YGdwdvSgtGJK8UeGx5QZfDWJ0Q9GPDyrYUDMpxXE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Guangguan Wang , Wen Gu , "D. Wythe" , "David S. Miller" , Sasha Levin Subject: [PATCH 6.6 043/116] net/smc: check smcd_v2_ext_offset when receiving proposal msg Date: Mon, 23 Dec 2024 16:58:33 +0100 Message-ID: <20241223155401.234973998@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241223155359.534468176@linuxfoundation.org> References: <20241223155359.534468176@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guangguan Wang [ Upstream commit 9ab332deb671d8f7e66d82a2ff2b3f715bc3a4ad ] When receiving proposal msg in server, the field smcd_v2_ext_offset in proposal msg is from the remote client and can not be fully trusted. Once the value of smcd_v2_ext_offset exceed the max value, there has the chance to access wrong address, and crash may happen. This patch checks the value of smcd_v2_ext_offset before using it. Fixes: 5c21c4ccafe8 ("net/smc: determine accepted ISM devices") Signed-off-by: Guangguan Wang Reviewed-by: Wen Gu Reviewed-by: D. Wythe Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/smc/af_smc.c | 2 ++ net/smc/smc_clc.h | 8 +++++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 079ca4f1077d..0acf07538840 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -2154,6 +2154,8 @@ static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, pclc_smcd = smc_get_clc_msg_smcd(pclc); smc_v2_ext = smc_get_clc_v2_ext(pclc); smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); + if (!pclc_smcd || !smc_v2_ext || !smcd_v2_ext) + goto not_found; mutex_lock(&smcd_dev_list.mutex); if (pclc_smcd->ism.chid) { diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h index a3706300e04f..6e24d44de4a7 100644 --- a/net/smc/smc_clc.h +++ b/net/smc/smc_clc.h @@ -384,9 +384,15 @@ smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop) static inline struct smc_clc_smcd_v2_extension * smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext) { + u16 max_offset = offsetof(struct smc_clc_msg_proposal_area, pclc_smcd_v2_ext) - + offsetof(struct smc_clc_msg_proposal_area, pclc_v2_ext) - + offsetof(struct smc_clc_v2_extension, hdr) - + offsetofend(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset); + if (!prop_v2ext) return NULL; - if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset)) + if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset) || + ntohs(prop_v2ext->hdr.smcd_v2_ext_offset) > max_offset) return NULL; return (struct smc_clc_smcd_v2_extension *) -- 2.39.5