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 1079E1F30AD; Wed, 19 Feb 2025 08:57:39 +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=1739955459; cv=none; b=M5TYLgJIJ5jDTXDcYss2YCasaK0UnZ3Mt8kHUQSTMNwitbX0JlA7EUSBPZBIjmK36HU9h1GgkJsITBD0/N/+BcV9KAn8WLJb4Z2uf7J61YpaRUpKYT0mWCToYLRa4PWBvrxq6MTAXDMjW3u/IQjOQR5+Xw72FFtMenTb8cnlfwo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739955459; c=relaxed/simple; bh=cn8xe8H6AkPtlE9c8RQj9mhEbXUU+85x5i29oA/kjCA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=r1scQcTL78VJYBFFPJWGuza57fZ5UX0OhDE+53hZuAQPLCKFmdB9sNY8jfSh5vWDU1khzy4ko/gDnf4BhaJg2M0hGTXAIM04QyZhBE8oo3EZvzR/uYykBIxGpyPrZ9Weqk77VPgKXKg99MMAgIg4hLvyICmLFX1yjPRoLAv6CTE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=eVF5L53N; 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="eVF5L53N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82373C4CED1; Wed, 19 Feb 2025 08:57:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739955458; bh=cn8xe8H6AkPtlE9c8RQj9mhEbXUU+85x5i29oA/kjCA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eVF5L53NSlokt+KWaVFIwgOWiuByvgNwB5McTmodNyoeqHknOjRdo2XnsmhTC9WSc MblpA8RoUNT0X7BG9dBkkOhFSW9tLWI1kbuczEavdoYaMdt5Dzwh2xJpRfQ/c9neL0 A45veIp5jWhzuSLKmgLKA4kWzs0McLifQ6hcWGsk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+1fcd957a82e3a1baa94d@syzkaller.appspotmail.com, Eric Dumazet , Jiri Pirko , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.6 013/152] team: better TEAM_OPTION_TYPE_STRING validation Date: Wed, 19 Feb 2025 09:27:06 +0100 Message-ID: <20250219082550.553773342@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250219082550.014812078@linuxfoundation.org> References: <20250219082550.014812078@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 5bef3ac184b5626ea62385d6b82a1992b89d7940 ] syzbot reported following splat [1] Make sure user-provided data contains one nul byte. [1] BUG: KMSAN: uninit-value in string_nocheck lib/vsprintf.c:633 [inline] BUG: KMSAN: uninit-value in string+0x3ec/0x5f0 lib/vsprintf.c:714 string_nocheck lib/vsprintf.c:633 [inline] string+0x3ec/0x5f0 lib/vsprintf.c:714 vsnprintf+0xa5d/0x1960 lib/vsprintf.c:2843 __request_module+0x252/0x9f0 kernel/module/kmod.c:149 team_mode_get drivers/net/team/team_core.c:480 [inline] team_change_mode drivers/net/team/team_core.c:607 [inline] team_mode_option_set+0x437/0x970 drivers/net/team/team_core.c:1401 team_option_set drivers/net/team/team_core.c:375 [inline] team_nl_options_set_doit+0x1339/0x1f90 drivers/net/team/team_core.c:2662 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x1214/0x12c0 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2543 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 ____sys_sendmsg+0x877/0xb60 net/socket.c:2573 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627 __sys_sendmsg net/socket.c:2659 [inline] __do_sys_sendmsg net/socket.c:2664 [inline] __se_sys_sendmsg net/socket.c:2662 [inline] __x64_sys_sendmsg+0x212/0x3c0 net/socket.c:2662 x64_sys_call+0x2ed6/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Fixes: 3d249d4ca7d0 ("net: introduce ethernet teaming device") Reported-by: syzbot+1fcd957a82e3a1baa94d@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=1fcd957a82e3a1baa94d Signed-off-by: Eric Dumazet Reviewed-by: Jiri Pirko Link: https://patch.msgid.link/20250212134928.1541609-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/team/team.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c index 46a7c9fb6300e..1ce3bccd4ebd4 100644 --- a/drivers/net/team/team.c +++ b/drivers/net/team/team.c @@ -2657,7 +2657,9 @@ static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info) ctx.data.u32_val = nla_get_u32(attr_data); break; case TEAM_OPTION_TYPE_STRING: - if (nla_len(attr_data) > TEAM_STRING_MAX_LEN) { + if (nla_len(attr_data) > TEAM_STRING_MAX_LEN || + !memchr(nla_data(attr_data), '\0', + nla_len(attr_data))) { err = -EINVAL; goto team_put; } -- 2.39.5