From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from n169-111.mail.139.com (n169-111.mail.139.com [120.232.169.111]) (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 2153B2E2DDD; Mon, 20 Apr 2026 05:43:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=120.232.169.111 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776663785; cv=none; b=ahahfuKXnzCpT8hwoPHaY8BFgSpozfaGm8VynlKocbGNtbJEWV0jsa6t7ftWMeiVVZnYfxqigbAhioWL5c5B6qmqJ98KJQBoatTV3U6EEI87dFCm7Lsh3HwBC6zqd9FGGfgS+X+PR75QBK/KM1JlImDer9B0psp0ly53yQt31/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776663785; c=relaxed/simple; bh=9kZiWNVHMmotTn9/tPAFXCLC52Qw7BX78Q8iiuoY4j8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=QA15BN4XkPZgggjDDj9NqtRVUfTm6YTFBDXlIe59BySRCm68dYIQvE6rLIdPQjmhkaODupQX+ockAPc5BHN46bPMsBYqWanlYrRzPhYRa9uajPsuKV8pcB6u+1rF5crQfnKFnDDk3uHYBCvumCm6KfLEZ/rOBz+kt8UJKS37SqY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=139.com; spf=pass smtp.mailfrom=139.com; dkim=pass (1024-bit key) header.d=139.com header.i=@139.com header.b=WMUlJkNB; arc=none smtp.client-ip=120.232.169.111 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=139.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=139.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=139.com header.i=@139.com header.b="WMUlJkNB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=139.com; s=dkim; l=0; h=from:subject:message-id:to:cc:mime-version; bh=47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=; b=WMUlJkNBteOhUrZe+3h/Fm0OimPwlJJI7mzW7nmFxn4A1VlXAz7m1JYPczNFzdyARRPrimbLMeUq/ 9XQ0iHzoHHE2LYv1akrkne80lu0cj/d2A/YkXBMt6r4n5DP5frPIRPedquxCOD5LqaWVirZmsQ1swF Yg/eDGRFa0ee92ek= X-RM-TagInfo: emlType=0 X-RM-SPAM: X-RM-SPAM-FLAG:00000000 Received:from NTT-kernel-dev (unknown[60.247.85.88]) by rmsmtp-lg-appmail-15-12004 (RichMail) with SMTP id 2ee469e5bcde7d7-02815; Mon, 20 Apr 2026 13:42:59 +0800 (CST) X-RM-TRANSID:2ee469e5bcde7d7-02815 From: Li hongliang <1468888505@139.com> To: gregkh@linuxfoundation.org, stable@vger.kernel.org, heminhong@kylinos.cn Cc: patches@lists.linux.dev, linux-kernel@vger.kernel.org, davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, david.lebrun@uclouvain.be, netdev@vger.kernel.org, andrea.mayer@uniroma2.it Subject: [PATCH 6.6.y] ipv6: add NULL checks for idev in SRv6 paths Date: Mon, 20 Apr 2026 13:42:58 +0800 Message-Id: <20260420054258.3043714-1-1468888505@139.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Minhong He [ Upstream commit 06413793526251870e20402c39930804f14d59c0 ] __in6_dev_get() can return NULL when the device has no IPv6 configuration (e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER). Add NULL checks for idev returned by __in6_dev_get() in both seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL pointer dereferences. Fixes: 1ababeba4a21 ("ipv6: implement dataplane support for rthdr type 4 (Segment Routing Header)") Fixes: bf355b8d2c30 ("ipv6: sr: add core files for SR HMAC support") Signed-off-by: Minhong He Reviewed-by: Andrea Mayer Link: https://patch.msgid.link/20260316073301.106643-1-heminhong@kylinos.cn Signed-off-by: Jakub Kicinski Signed-off-by: Li hongliang <1468888505@139.com> --- net/ipv6/exthdrs.c | 4 ++++ net/ipv6/seg6_hmac.c | 2 ++ 2 files changed, 6 insertions(+) diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 676284b6efe8..a8790163e8b6 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -378,6 +378,10 @@ static int ipv6_srh_rcv(struct sk_buff *skb) hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); idev = __in6_dev_get(skb->dev); + if (!idev) { + kfree_skb(skb); + return -1; + } accept_seg6 = net->ipv6.devconf_all->seg6_enabled; if (accept_seg6 > idev->cnf.seg6_enabled) diff --git a/net/ipv6/seg6_hmac.c b/net/ipv6/seg6_hmac.c index 6e15a65faecc..bf97bf5ac138 100644 --- a/net/ipv6/seg6_hmac.c +++ b/net/ipv6/seg6_hmac.c @@ -244,6 +244,8 @@ bool seg6_hmac_validate_skb(struct sk_buff *skb) struct inet6_dev *idev; idev = __in6_dev_get(skb->dev); + if (!idev) + return false; srh = (struct ipv6_sr_hdr *)skb_transport_header(skb); -- 2.34.1