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 5316133D50F; Fri, 9 Jan 2026 12:03:57 +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=1767960237; cv=none; b=E8fl5IziqI80C68DMQlIW72ly97KHpo1PFtwzV8kS30P8DVoAo2hgaLUiT7tZmql5xyw2sR55fWowHIQpBE48/dQ4DmK0gnhzCiGjevtDdMPsApd2ZR/QBU0ygNp7lEpvb/c77h1Nfo5T6D3BjSWDgg2nftR0QDjn5y9BBgCBRs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767960237; c=relaxed/simple; bh=W6frvKzjJJ9kUVk7sD8yLZeUEtp+38KtRqLfIQAU7Is=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uCc+VD7/rDJNytSQMoO6G9PibJkTeRZj11JP5AOM7bTyKDNafiSMz10aBQYXO4DAbH68grOHdZ5+Sd4hGYLL+tkDdsJUbT3cAI+GWL3kKRVURndbBCVfbeXtVjWz1DL/KkEvNVgOpZf3gTXfJwvwbfLtYWEcbZKDJNLMySCkvsc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GClzW7LL; 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="GClzW7LL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CDCD3C4CEF1; Fri, 9 Jan 2026 12:03:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767960237; bh=W6frvKzjJJ9kUVk7sD8yLZeUEtp+38KtRqLfIQAU7Is=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GClzW7LL9komx4pI2pgUZ2ZXPiqrftQrnVSefp4+YPGIDR5p7KlGg18idsIfmvv1e idl5CdIoN6HoAQmKYwqQS8fnG/4BVhiDsMkyBU+t8f2m7SIdfVqCJS6NU26sWtGZtF nGZVQKdoTXheZYVj4Bzk7I1eYadG6R0zh9B6DtFI= 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 6.6 334/737] ipvlan: Ignore PACKET_LOOPBACK in handle_mode_l2() Date: Fri, 9 Jan 2026 12:37:53 +0100 Message-ID: <20260109112146.556606511@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112133.973195406@linuxfoundation.org> References: <20260109112133.973195406@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 6.6-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 ca62188a317ad..83bd65a227709 100644 --- a/drivers/net/ipvlan/ipvlan_core.c +++ b/drivers/net/ipvlan/ipvlan_core.c @@ -737,6 +737,9 @@ 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