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 616C630BF67 for ; Thu, 28 May 2026 11:52:45 +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=1779969166; cv=none; b=MXTjy9IWwwRgVge+BXcHd/TAWuddXTGpArhvnjGsaBajGlV3F5TzvHc9AGfVQKnnleJsa2+2Qxtbl3Fo8yOqDS2rREURUtm/IXfe5s+6yxd/iGoy6H1alaaqd+SatDRlxqBRhg5cnrFLKULnLL/C5+eSD73BWYh2Ctguo0xMYcQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779969166; c=relaxed/simple; bh=8ag5E6BoSQDjJkojSe6ZsKFPlVz6PwMSOMyTjbI4YDs=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=NXswdE4tK0J9j+3jQgs3Pqa5DsDMiR0XpDuty2yyzmUXRdBNZFj/Qqq/jbu84qy5hekX7O+MzF5QzBsy1jfSuJfZX7YOZk8NKGmHQ4HejeiLg7pRbbN15naFReyq8jKUobopcqt5JuHwLWUMtkZwIUZQbCdWc5yTd2meuHa5CvU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Fl1yhVQu; 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="Fl1yhVQu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7876A1F000E9; Thu, 28 May 2026 11:52:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779969165; bh=n2UtUZTEewEWoaZ5a0FaGoZh4XM6a06tLDiqM7nzSdo=; h=Subject:To:Cc:From:Date; b=Fl1yhVQu2yx56lyQzfPTZ8jM+NXSE3nSWIWwdFUhR7Ts/y62qjwByScLQ2RQfgfWm WhJEgHxrsdAbCuStOpriKT1pysQwBWziUe2z7sjbIT6PUBAg8+rimZYE/FmOeZT9e9 JrAT4AmBqSZUAHncWxj8TWNYMaFZFpYuN4Qed8BA= Subject: FAILED: patch "[PATCH] batman-adv: tvlv: reject oversized TVLV packets" failed to apply to 6.6-stable tree To: sven@narfation.org,bird@lzu.edu.cn,tomapufckgml@gmail.com,yifanwucs@gmail.com,yuantan098@gmail.com Cc: From: Date: Thu, 28 May 2026 13:51:37 +0200 Message-ID: <2026052837-flogging-ambiguous-1e0e@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x f50487e3566358b2b982b7801945e858c78ad9ab # git commit -s git send-email --to '' --in-reply-to '2026052837-flogging-ambiguous-1e0e@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From f50487e3566358b2b982b7801945e858c78ad9ab Mon Sep 17 00:00:00 2001 From: Sven Eckelmann Date: Sat, 9 May 2026 21:55:29 +0200 Subject: [PATCH] batman-adv: tvlv: reject oversized TVLV packets batadv_tvlv_container_ogm_append() builds a TVLV packet section from the tvlv.container_list. The total size of this section is computed by batadv_tvlv_container_list_size(), which sums the sizes of all registered containers. The return type and accumulator in batadv_tvlv_container_list_size() were u16. If the accumulated size exceeds U16_MAX, the value wraps around, causing the subsequent allocation in batadv_tvlv_container_ogm_append() to be undersized. The memcpy-style copy that follows would then write beyond the end of the allocated buffer, corrupting kernel memory. Fix this by widening the return type of batadv_tvlv_container_list_size() to size_t. In batadv_tvlv_container_ogm_append(), check the computed length against U16_MAX before proceeding, and bail out as if the allocation had failed when the limit is exceeded. Cc: stable@kernel.org Fixes: ef26157747d4 ("batman-adv: tvlv - basic infrastructure") Reported-by: Yuan Tan Reported-by: Yifan Wu Reported-by: Juefei Pu Reported-by: Xin Liu Reviewed-by: Yuan Tan Signed-off-by: Sven Eckelmann diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c index 46ed61dbf087..cc6ac580c620 100644 --- a/net/batman-adv/tvlv.c +++ b/net/batman-adv/tvlv.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -160,10 +161,10 @@ batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version) * * Return: size of all currently registered tvlv containers in bytes. */ -static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) +static size_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) { struct batadv_tvlv_container *tvlv; - u16 tvlv_len = 0; + size_t tvlv_len = 0; lockdep_assert_held(&bat_priv->tvlv.container_list_lock); @@ -316,13 +317,17 @@ int batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, { struct batadv_tvlv_container *tvlv; struct batadv_tvlv_hdr *tvlv_hdr; - u16 tvlv_value_len; + size_t tvlv_value_len; void *tvlv_value; int tvlv_len_ret; bool ret; spin_lock_bh(&bat_priv->tvlv.container_list_lock); tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); + if (tvlv_value_len > U16_MAX) { + tvlv_len_ret = -E2BIG; + goto end; + } ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, packet_min_len, tvlv_value_len);