From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from n169-113.mail.139.com (n169-113.mail.139.com [120.232.169.113]) (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 83C4A35A381; Mon, 20 Apr 2026 05:43:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=120.232.169.113 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776663818; cv=none; b=h1WwrfpRSJcqUkRctt9xkjLufEZWoFOdT8AgvIyrDv+WXsU3I8WXqTLwwxKEUcfofghEFatUxjEwxDivxbaNQCNxfIbK+uiGNwBZF9l6nX9Ze4lzxQEj5QA2h72gEn7uRBzR76IEdxeGYm0YMIbSALrZUapc23cpNMDBHKZfsGY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776663818; c=relaxed/simple; bh=5IquD4tkjav+yz6CV8S9fLdCQgwSnSz1y85Sh16Wtyw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=Eyk9roZP72ebm1ZV1/IFtNMeC1P9a7TuaCeTSIC6W46A2mIcFAKE2hAga79ft8s8qPiu+015JYTX9tuKDfmlP1zKLng5et53IkDBroTkbl4Wx4i35mBMLYzFErEh/ber5r89iVZ7XBZ7uKvCP69wSmfijLqlUrJd6q5bJuCuiHs= 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=GPajPADq; arc=none smtp.client-ip=120.232.169.113 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="GPajPADq" 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=GPajPADqQXtPCs5vOa+qhpdRa9wpTx9tiKDThGbCR4SGEvxTvOXb1YEK5I0kJP0alhSjzl1I33Fe9 YX/xouBHU6pRu+mLPCTo3ZGCKXJMhu+OjOI0lTPGcmdE/+eLwTpi0UdnFT7HC0o0mE28ILjzwKZivy xQ+Wm2PDBo2KVAtU= 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-32-12046 (RichMail) with SMTP id 2f0e69e5bcf8d81-01da7; Mon, 20 Apr 2026 13:43:24 +0800 (CST) X-RM-TRANSID:2f0e69e5bcf8d81-01da7 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 5.15.y] ipv6: add NULL checks for idev in SRv6 paths Date: Mon, 20 Apr 2026 13:43:21 +0800 Message-Id: <20260420054321.3043814-1-1468888505@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 10772dab66bb..3d249c10e3e9 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -373,6 +373,10 @@ 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 7e3a85769932..68acff337e41 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