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 1AB341C3F34; Mon, 10 Mar 2025 18:13:27 +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=1741630408; cv=none; b=kM91UYFu9qCN3BJ1gajL5XYWOGKt6mCIZ0Rz0E4G7vzyPUtjtwLzyeDiGuipMZFPJP/+o84O/qNJ0GNo5+sE4iYvgZt2HAC7fbICie731wQvqtkjryBYdCLPFX5RTDpjaDwqXGuE4ni8ZYIm+cl4+OyyBm5jgNFXB+Fma839rYQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741630408; c=relaxed/simple; bh=JuihhxxGmv8Ehc4yuD9wtGLztx6+1ZQ169EzZXTKlZ0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RGKyjByNJ1v8YkYDzJ+ie0SMIP/x9tcpqksxQ/bx3sIAmnBDhYLLwiY7Nw+vMAbovGi4CAx1FwUQZFndmV77HxX5/LuMe2hHr26xCAh8mJJlrjWeywWRf0HdlzPm79IC8IRP1/ip0IXPevvnU1fYPz/R+M0Gjiq6pFZWRcXxPxI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=c8542KSo; 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="c8542KSo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2474CC4CEE5; Mon, 10 Mar 2025 18:13:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741630407; bh=JuihhxxGmv8Ehc4yuD9wtGLztx6+1ZQ169EzZXTKlZ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c8542KSoQ27yX9weZHKL2rB5z8ij07PWV5lyYoKRm+FVYvEhSJTR3bxWadAd/C266 lWIeOAhl1MvKrHC0z3rLu+3kSW6zQF3nwHvfUswdue5RIfXs2HstwAeNFyaAo3+hKk ligPpqjFSELkiMfG9nSSFaJRjuExRSqcN6QziDEA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 396/620] ipv4: use RCU protection in inet_select_addr() Date: Mon, 10 Mar 2025 18:04:02 +0100 Message-ID: <20250310170601.223215257@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170545.553361750@linuxfoundation.org> References: <20250310170545.553361750@linuxfoundation.org> User-Agent: quilt/0.68 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: Eric Dumazet [ Upstream commit 719817cd293e4fa389e1f69c396f3f816ed5aa41 ] inet_select_addr() must use RCU protection to make sure the net structure it reads does not disappear. Fixes: c4544c724322 ("[NETNS]: Process inet_select_addr inside a namespace.") Signed-off-by: Eric Dumazet Link: https://patch.msgid.link/20250205155120.1676781-7-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv4/devinet.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index dcbc087fff179..33e87b442b475 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -1316,10 +1316,11 @@ __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) __be32 addr = 0; unsigned char localnet_scope = RT_SCOPE_HOST; struct in_device *in_dev; - struct net *net = dev_net(dev); + struct net *net; int master_idx; rcu_read_lock(); + net = dev_net_rcu(dev); in_dev = __in_dev_get_rcu(dev); if (!in_dev) goto no_in_dev; -- 2.39.5