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 A016C1CAA82; Tue, 8 Apr 2025 11:48:30 +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=1744112910; cv=none; b=e6YDOie1a2wFs03x3SZLY1/fr1uGkrPEl6h7HbwL2x++vjwzSLT4DDydM4ZBoSLI2dI0B7L78o8hn4JzSUENxtBZ0xmvFWOE2ldZbThhKhcY2LP652vvEMEelchPy24qSdU/52WPjXqT9aJa7ihKhq4Hw42rcj8FsJ6hqk7mvOA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744112910; c=relaxed/simple; bh=8EGxqHbxWehlZPoyy4JK5YPv3tb1elvFrFA2Liz2Ffw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Go1Ufs1wMqJJTu0jDjrTphDvHY+RELHYcNbMrzAyD93F71Iteilr0h4ESrlea2R6ewgtLluhOSNXnqk/KevLEvQV63SjRdpquC9MAoPT3fCwG4J8pIn6PCpZ/im1ekPHnqzsXHb7AIbtHOBJxoMzTYnJVTsSsfkgZ5q5ojECP8M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=p5ndmt86; 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="p5ndmt86" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DACDC4CEE5; Tue, 8 Apr 2025 11:48:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744112910; bh=8EGxqHbxWehlZPoyy4JK5YPv3tb1elvFrFA2Liz2Ffw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p5ndmt86rkJ6U5QzgJzCLHIfy7Ga1SBVu9xUCoC0sZ5xV9NDWgd3OOG7XS6yVGUwV qpovQ25a5V9H1BCqwAk1A88B8cpNjzuPHU4RfOdbwS0LrAFA4+KH8iqLaY5MsN5l4l yCx/UWInzMKct9qREyfXCjze6Ql5UgD9lzMbe30E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Debin Zhu , Bitao Ouyang <1985755126@qq.com>, Paul Moore , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 242/279] netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets Date: Tue, 8 Apr 2025 12:50:25 +0200 Message-ID: <20250408104832.916918017@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104826.319283234@linuxfoundation.org> References: <20250408104826.319283234@linuxfoundation.org> User-Agent: quilt/0.68 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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Debin Zhu [ Upstream commit 078aabd567de3d63d37d7673f714e309d369e6e2 ] When calling netlbl_conn_setattr(), addr->sa_family is used to determine the function behavior. If sk is an IPv4 socket, but the connect function is called with an IPv6 address, the function calipso_sock_setattr() is triggered. Inside this function, the following code is executed: sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; Since sk is an IPv4 socket, pinet6 is NULL, leading to a null pointer dereference. This patch fixes the issue by checking if inet6_sk(sk) returns a NULL pointer before accessing pinet6. Signed-off-by: Debin Zhu Signed-off-by: Bitao Ouyang <1985755126@qq.com> Acked-by: Paul Moore Fixes: ceba1832b1b2 ("calipso: Set the calipso socket label to match the secattr.") Link: https://patch.msgid.link/20250401124018.4763-1-mowenroot@163.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv6/calipso.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c index 1578ed9e97d89..c07e3da08d2a8 100644 --- a/net/ipv6/calipso.c +++ b/net/ipv6/calipso.c @@ -1075,8 +1075,13 @@ static int calipso_sock_getattr(struct sock *sk, struct ipv6_opt_hdr *hop; int opt_len, len, ret_val = -ENOMSG, offset; unsigned char *opt; - struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk)); + struct ipv6_pinfo *pinfo = inet6_sk(sk); + struct ipv6_txoptions *txopts; + + if (!pinfo) + return -EAFNOSUPPORT; + txopts = txopt_get(pinfo); if (!txopts || !txopts->hopopt) goto done; @@ -1128,8 +1133,13 @@ static int calipso_sock_setattr(struct sock *sk, { int ret_val; struct ipv6_opt_hdr *old, *new; - struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk)); + struct ipv6_pinfo *pinfo = inet6_sk(sk); + struct ipv6_txoptions *txopts; + + if (!pinfo) + return -EAFNOSUPPORT; + txopts = txopt_get(pinfo); old = NULL; if (txopts) old = txopts->hopopt; @@ -1156,8 +1166,13 @@ static int calipso_sock_setattr(struct sock *sk, static void calipso_sock_delattr(struct sock *sk) { struct ipv6_opt_hdr *new_hop; - struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk)); + struct ipv6_pinfo *pinfo = inet6_sk(sk); + struct ipv6_txoptions *txopts; + + if (!pinfo) + return; + txopts = txopt_get(pinfo); if (!txopts || !txopts->hopopt) goto done; -- 2.39.5