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 4424C560AC2 for ; Tue, 8 Sep 2026 16:21:01 +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=1788884463; cv=none; b=W2kkDKHuPxZmrLCntBfVwfEAtk3v+xYjOI8WGSZgFP3lDL2xsmh6qRwIXi1JwlV8FTFS46Q0+4eadCcXsr424y9MdPWETNQXIjpJ9CYhE9xHVOPquFUFA1l9hYx0FEbtsznR7Pbkw1su5mU1+vFcpqU6bmot8fQXmW0khreFOzU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788884463; c=relaxed/simple; bh=v4hhMnVLcFZeBPcSLNn7XM2v/il/STVD/bok+kbRENY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=V030dIy2TM297eLCUoTsdXdeLS1FqP6DeJwFzU+l9Ngp/Dk1wWbrlj82Wr9N6OiXaGjmL3nfoIG7kbYPKW1C3VUJxVQHPCam//2I7uX6CczAwTpKsdGdJSHNtEsxGMFQbV3vyfaHWav73J1Mqec5v8YI6wc+axD2JH8x74Saiq4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eLtm+9Hg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eLtm+9Hg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5838B1F00A3D; Tue, 8 Sep 2026 16:21:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788884461; bh=IOFK4LKTW2lmNj32xGmNZoLTnlkFRY5iJpIzaUiE7zQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=eLtm+9HgkI1XFSYZvVCtOJwVTJ9BIWjPPeexUD/1AbRvh8F/C622svxctmnqObgdq khkxBW5YVZvj0JxR/HYWtGrrWeelHZgVP2KWxsQRScZcHlObcVGebUvMF4bw+29W6P jdB/KY+hSWfXbX93055sD2KVmk41fPHhxqBCwcvwz74vfIqjQb6ky0wsse7qrKrbgp RDIRUgLGkV37E2WRYsrKlMQTCHL+UJgDZkikvNCytvzXAE15ipl931Nb33fx593Ojc 0+IHXzEz7c79dO3NhB35ZgmgeLdJa5516OyLoxa6Nc1RLI1uyoeu9apnHXKFEVmYQw zsbJeRS4Js87Q== From: Sasha Levin To: stable@vger.kernel.org Cc: Yue Haibing , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12.y 1/2] ipv6: annotate data-races around devconf->rpl_seg_enabled Date: Tue, 8 Sep 2026 12:20:58 -0400 Message-ID: <20260908162059.2629725-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090349-gone-tricky-59ac@gregkh> References: <2026090349-gone-tricky-59ac@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Yue Haibing [ Upstream commit 3a5f55500f3e93cf4d62351c753452279b088b4b ] devconf->rpl_seg_enabled can be changed concurrently from /proc/sys/net/ipv6/conf, annotate lockless reads on it. Signed-off-by: Yue Haibing Link: https://patch.msgid.link/20250901123726.1972881-2-yuehaibing@huawei.com Signed-off-by: Jakub Kicinski Stable-dep-of: f826df95332c ("ipv6: rpl: fix NULL dereference of idev in ipv6_rpl_srh_rcv()") Signed-off-by: Sasha Levin --- net/ipv6/exthdrs.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index e91afe5ec0b5d..e1e64e5507d22 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -504,10 +504,8 @@ static int ipv6_rpl_srh_rcv(struct sk_buff *skb) idev = __in6_dev_get(skb->dev); - accept_rpl_seg = net->ipv6.devconf_all->rpl_seg_enabled; - if (accept_rpl_seg > idev->cnf.rpl_seg_enabled) - accept_rpl_seg = idev->cnf.rpl_seg_enabled; - + accept_rpl_seg = min(READ_ONCE(net->ipv6.devconf_all->rpl_seg_enabled), + READ_ONCE(idev->cnf.rpl_seg_enabled)); if (!accept_rpl_seg) { kfree_skb(skb); return -1; -- 2.53.0