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 12ACD46EF60; Tue, 21 Jul 2026 19:53:20 +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=1784663601; cv=none; b=d3Csn4lPSuMshIwka3gCymbyCwOpVFF1qbYTzOnieMEPo3tEbkdglPYcrt/5ikFEViaUsEWSNTAeK1PnyRuIYckUhaY/evz8c2Jy+yh81lk/Z0uRAPIyw5NVHaVTGU8EZv1JGbNvNUdpGqGsQrYfueP1zh1gxe5sMjEmBM8fHfA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784663601; c=relaxed/simple; bh=5EphviklggIxwQ2wKfxilgX2Yz6p3ie1NnWNoLkRUxQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nPSE2gaCjOgHK97YcOR74xCFHlSzak1+A3Ky7KfFyIVHU50JeL8ACrcy6JiAmZ9NefToRcYtMTUGMcgv+prQsat1wdQMSJZ3OwnaoZoYz4OJqqD2gRE4LckjrJsBjdjwkFBmbCJbM52KyekNoAfsyq3TO5fs015UGB06rp6HEds= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=G9iq49hv; 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="G9iq49hv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 733541F000E9; Tue, 21 Jul 2026 19:53:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784663600; bh=3cB3xNb+ComEoiubT2xiAWRE5OsykIE6D/ldIU3RTeo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=G9iq49hv8DxfL2lq0JYSESlTlLYbR215poLU95rLXqlOkMivi08a6upUL+I+/nWVj 3Pwy1kD16ft7eO/FunLcMg7N/sWtd8NFZY0/l/ReR1FuVAHl9944hT0BFgNa2UL+Jt 5oV0Kbm0Lqt/NIQCo1NKXKqNh4WH8fXIWix8a8+4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sven Eckelmann Subject: [PATCH 6.12 0885/1276] batman-adv: bla: reacquire gw address after skb realloc Date: Tue, 21 Jul 2026 17:22:08 +0200 Message-ID: <20260721152505.854275343@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152446.065700225@linuxfoundation.org> References: <20260721152446.065700225@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sven Eckelmann commit cdf3b5af2bc4431e58629e8ad2086b1e9185c761 upstream. The pskb_may_pull() called by batadv_bla_is_backbone_gw() could reallocate the buffer behind the skb. Variables which were pointing to the old buffer need to be reassigned to avoid an use-after-free. Cc: stable@vger.kernel.org Fixes: 9e794b6bf4a2 ("batman-adv: drop unicast packets from other backbone gw") Signed-off-by: Sven Eckelmann Signed-off-by: Greg Kroah-Hartman --- net/batman-adv/routing.c | 1 + 1 file changed, 1 insertion(+) --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -1036,6 +1036,7 @@ int batadv_recv_unicast_packet(struct sk hdr_size); batadv_orig_node_put(orig_node_gw); if (is_gw) { + orig_addr_gw = eth_hdr(skb)->h_source; batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Dropped unicast pkt received from another backbone gw %pM.\n", __func__, orig_addr_gw);