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 84A9344AB8E; Tue, 21 Jul 2026 22:50:26 +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=1784674227; cv=none; b=iQO/I7TSyfLc1aOnuzzjYXFl3dGLXywMFmnUob6p/enCQoMP7kK/gLg67cZHaFARdNGqheWr0aif+BjQWdR4Bz9CUkyaX47m7vBl6JRWp68YGNpI/vcNgCo0saDLVGSv679R5P6XKrfpIZGz5Q0eK0x39mECOpR1XGEb1DPM07c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784674227; c=relaxed/simple; bh=8hqCBZ34+0CJ7X2IN24giG+gSanYnSiwPB7XQB08bRw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LM0ReDKWS4gnlU/c36nIj8yzOuG1eAO+P8xVQmevlOBMbjWMGnZykB0lzxQI1QX5jKUD2ff+7ZSYcL8MpAuS7aJNtV/jOjIiNy0dugb3qmd2Rz6p6loieaJJGha+iS9CSQP7B7By+bvN6nI1514rmP8ImsNB83OU63vICP1JFX8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q9H82nvA; 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="Q9H82nvA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB4BF1F000E9; Tue, 21 Jul 2026 22:50:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784674226; bh=ZMjvrwWAeV3fmSIeM2Ae9HYwvEs87kFI8mr38hPRyME=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Q9H82nvAXrGtcCMuiPOn8Ux3OW+S6TCIahQGt+qonyNLt1nQ0rdtIcmz7xoPGuJtc zA2HAJgXrqbJ2L0crIwzHOkL9JJAsiZGwI6furxhoD+/309xBsBx1jmPbQpXfsvSpv 0Hkxj935P2BWjkN3m+9GU2lVrMaTx0sVjZUFyO94= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sven Eckelmann Subject: [PATCH 5.10 462/699] batman-adv: bla: reacquire gw address after skb realloc Date: Tue, 21 Jul 2026 17:23:41 +0200 Message-ID: <20260721152406.119165633@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152355.667394603@linuxfoundation.org> References: <20260721152355.667394603@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 5.10-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 @@ -1002,6 +1002,7 @@ 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);