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 334DB45DF74; Tue, 21 Jul 2026 22:21:00 +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=1784672461; cv=none; b=kYhkK44RMkV5sETVKMvEGcbLVDBAbKGQSaebHzuPhy94QuxRTvjNM9vQJV2apf022wbKlTd72NNhHnO+0ElmHoI4pfh1ujUd+W3Z2fwFrfrfcI4sbojrq5O7IiBqTSZAXVKzLN/+u//sM7NkM4tBJUSssAQsPRYJe/25yVsjGkE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672461; c=relaxed/simple; bh=YRJv1Bv6Cm5Iy6r1NinN4SncT+So0qSxzsz5XfHjN+U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t9PBMaIkVhO1+DVPKD3CX3pWvBTG04lLgqkmpMYLR6WFCjP70jc9luon5P3oB/DY+SWhYCizbGiT1spz+QJCxowgr7ZPMIiL2rHPy1bNU2El3RwiqMcmI8YQlORwdppsSGMqccOQuKdRRx5fvFfy9ymPAvIhwZuMjY9pbpldOqc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=plQCcBk+; 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="plQCcBk+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A0781F000E9; Tue, 21 Jul 2026 22:20:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672460; bh=zJff40fhgqJXU3SoSHTZ7aZNLqBQb52R5PrHXieKHB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=plQCcBk+mQITCSMBcuV74tn4LQRgxtChFQ+cobTyxt9Nkhcx4rYlioGTbHG2s/oy3 rkvPSIXLL4vE/wCKkCuHKpVLdmQgzu1Ud4EErD3tPjOA4TI9Qsmw0LJrqn9blYdgaZ R8OQetCF49FgZPYB4i27KnLikroiW3NyRM0wgLes= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sven Eckelmann Subject: [PATCH 5.15 590/843] batman-adv: bla: reacquire gw address after skb realloc Date: Tue, 21 Jul 2026 17:23:45 +0200 Message-ID: <20260721152419.322949953@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 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 @@ -1034,6 +1034,7 @@ 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);