From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 81DFE443E26; Tue, 21 Jul 2026 22:19:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672363; cv=none; b=A4mNMH7fjFE3Zsby4AjqtbvnXKXIIkJJHlTlFqnd38Xtw1NMTgGIn3e/iyG01nqigBPa9mTvvbcnoPELe3YCaaAx9qzNxq6TlQX9XkGi2bv2lpt0psdF6yHpCYxAhnftACIQEU+aJRaWEgdbG0XSS4qeMGZyHnSk6PZ66t37PD0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672363; c=relaxed/simple; bh=PAtVKiDvfsv/0IvTrj1NefmKwerltMkKv+Py3vIA//s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nvgfFMeRl+Iro5c4653s5ctqtUw8OgGERoCJLsWASm5CazeVpz8hEFGoO3NlVySUYmvMD98Q35uNmhUVeIhwi9qa4ecr3dsX89BnGu9nwe5x95hCHg/aouYtmaVKHJJlM3vHteX/zZyPYQx9ExnZ3u0kSvA92ClSiJTQjIRLejo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PVQY/TAU; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="PVQY/TAU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E7A971F000E9; Tue, 21 Jul 2026 22:19:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672362; bh=Dl4CEOr3jTwMXlEgDLVb2ZSsvVb2PH1VkztQLmSNXLQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PVQY/TAULwIgEhktCTU7H7MIYLjQjNMZa9/FgyaYk7vsFMui2Wm1m6adaREPTn+29 nlE5ngJ0T5rPekMOQ/Myw2/1VplobFWJmOYGcGPKG7tla4KVRDdeOSS8XmKXowuIBx MP/6CrCR9F2V1nVGO6POzZaDJwavTMDzHM0OPSOg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sven Eckelmann Subject: [PATCH 5.15 597/843] batman-adv: tt: prevent TVLV OOB check overflow Date: Tue, 21 Jul 2026 17:23:52 +0200 Message-ID: <20260721152419.477390179@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev 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: Sven Eckelmann commit 7a581d9aaba8c82bd6177fa36b2588eea77f6e2b upstream. A TT unicast TVLV contains the number of VLANs stored in it. This number is an u16 and gets multiplied by the size of the struct batadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16 used to store the tt_vlan_len. All additional safety checks to prevent out-of-bounds access of the TVLV buffer are invalid due to this overflow. Using size_t prevents this overflow and ensures that the safety checks compare against the actual buffer requirements. Cc: stable@vger.kernel.org Fixes: 7ea7b4a14275 ("batman-adv: make the TT CRC logic VLAN specific") Signed-off-by: Sven Eckelmann Signed-off-by: Greg Kroah-Hartman --- net/batman-adv/translation-table.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -4101,7 +4101,8 @@ static int batadv_tt_tvlv_unicast_handle u16 tvlv_value_len) { struct batadv_tvlv_tt_data *tt_data; - u16 tt_vlan_len, tt_num_entries; + u16 tt_num_entries; + size_t tt_vlan_len; char tt_flag; bool ret;