From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E58542D9494; Thu, 15 Jan 2026 17:24:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768497850; cv=none; b=WtzDHuTJJzgIaznz5NKRylagvIVsGUz3I/+7J417tKI/w5phwxBFeZFdjC0z+Kskdv9pn2ZiNl+eUu65qmJij2g3ZZsFWQATYEAblA2JDtqdTHHyGY6yBdRo53PH+GsLH5ifcclVcEfD3txg93DxK3Ao4OBV9GRC3ZO4XkDkvIg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768497850; c=relaxed/simple; bh=mE6I6U4Cvebo4fodznGB+VFlixQqMRf5QmqwvZxVod4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EtFnT5bRxIWCTxWdua/Bzl50A8+WIBJywzcd6BrbbQjzMz6qTRsvcg0bxSqI9YunHOLXwcm+MyFSYXkE1fuMAA4McgGs2vZcIYVB3OrawPsRcAMLW5c/CoWDf0ptdZqt/FbOYbL8JJSLRpqwmstYGSESQkxCi2biQH94GNmRxKQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=T/+6J0Xf; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="T/+6J0Xf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71A37C116D0; Thu, 15 Jan 2026 17:24:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768497849; bh=mE6I6U4Cvebo4fodznGB+VFlixQqMRf5QmqwvZxVod4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T/+6J0XfQiWvjrp/nioxTHkup1K/AqtZrZw8esTLGKKIxBf5J6RRpKSF3IenWXUXV 2xhQHzG/6/etzTVUtNs4gKNkb51uC2jh3hZUbcrioLDHSn6OnJUm0MOnYUiyBWH2XV OGCUZZ3wKzgsmXjnNXbcNL4hcEpv+AdCBoQOqfJQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dmitry Skorodumov , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 225/554] ipvlan: Ignore PACKET_LOOPBACK in handle_mode_l2() Date: Thu, 15 Jan 2026 17:44:51 +0100 Message-ID: <20260115164254.390605324@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164246.225995385@linuxfoundation.org> References: <20260115164246.225995385@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: Dmitry Skorodumov [ Upstream commit 0c57ff008a11f24f7f05fa760222692a00465fec ] Packets with pkt_type == PACKET_LOOPBACK are captured by handle_frame() function, but they don't have L2 header. We should not process them in handle_mode_l2(). This doesn't affect old L2 functionality, since handling was anyway incorrect. Handle them the same way as in br_handle_frame(): just pass the skb. To observe invalid behaviour, just start "ping -b" on bcast address of port-interface. Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.") Signed-off-by: Dmitry Skorodumov Link: https://patch.msgid.link/20251202103906.4087675-1-skorodumov.dmitry@huawei.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/ipvlan/ipvlan_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c index a18b49db38ee0..35ec6d1af6ea6 100644 --- a/drivers/net/ipvlan/ipvlan_core.c +++ b/drivers/net/ipvlan/ipvlan_core.c @@ -725,6 +725,9 @@ static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, struct ethhdr *eth = eth_hdr(skb); rx_handler_result_t ret = RX_HANDLER_PASS; + if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) + return RX_HANDLER_PASS; + if (is_multicast_ether_addr(eth->h_dest)) { if (ipvlan_external_frame(skb, port)) { struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); -- 2.51.0