From nobody Fri Dec 19 20:34:10 2025 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 C3B281420CC; Wed, 13 Mar 2024 16:42:54 +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=1710348174; cv=none; b=AH7f3jKvsISf3NvjqZwESGAXPgRt1jWkCT1zMM2QJovlx/fxWWvPejWiP13tEZG0eCOYHE/0Fd59g+aPm1PdMjTTS4uYr4/XxtzSYWq6Uo05VlD//135TVWuHfZAqRKxiTJJlUGJZNUMUWqgk45UZ4y2zTiZkiMkBqaPSIkJDnk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710348174; c=relaxed/simple; bh=H4DfSV2MBlhDn7HAlV8mC+leAoVxNyHqkIWIC7yYs+s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qTxu71f8iepXCgp1bd70uTo+1g4FkHxFNjMPif9CNpupnWEoc8TmqYNntFgBFD4EBLiu7gSOWAd1A9GuXXNlEMCMv0pbX4h16aiOgtRgIYzQ4tj7urg0iWaTAMLt+rc4ZWg9bMAFQG6T3Yg6pU/vkca1P3iKW0sQxbuw3UiA8Yw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fbYXXriC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fbYXXriC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 643EBC43394; Wed, 13 Mar 2024 16:42:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710348174; bh=H4DfSV2MBlhDn7HAlV8mC+leAoVxNyHqkIWIC7yYs+s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fbYXXriCqeIPpqtmHHHXgZHNGLCk+s7MsIrIwM9i1ssAo6cqhmR8cKjTTeGrloTYT jXDzO4AortCT84P6jCHvjh4soqD76REpHvg5yTNbEF3+JTp21kXVhETlEanz4XJnih e+YsK52cBw/dFc9yB7SGCLrkis4QUP1kevg4Zf65FwroNnxWRW542DMnSmxFr/1+Nv ISQPMkUfzzoki+eoHztNj3siXnzwSICoe3R2Ju5sL72HKArbrhIkyjnbiew7ibklWe qpGhe9Z6Uj4GOKIrYq+9wRxGNCYNE1ogikkqWeVfg0D3IPBf67vPcLSuJ4VykRuCIY nsU5AMvKY7czQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jason Xing , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 25/76] netrom: Fix a data-race around sysctl_netrom_routing_control Date: Wed, 13 Mar 2024 12:41:32 -0400 Message-ID: <20240313164223.615640-26-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240313164223.615640-1-sashal@kernel.org> References: <20240313164223.615640-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.15.152-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-5.15.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 5.15.152-rc1 X-KernelTest-Deadline: 2024-03-15T16:42+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jason Xing [ Upstream commit b5dffcb8f71bdd02a4e5799985b51b12f4eeaf76 ] We need to protect the reader reading the sysctl value because the value can be changed concurrently. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Jason Xing Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/netrom/nr_route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c index e5d24462d5100..56bec5b5b37c7 100644 --- a/net/netrom/nr_route.c +++ b/net/netrom/nr_route.c @@ -780,7 +780,7 @@ int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25) return ret; } =20 - if (!sysctl_netrom_routing_control && ax25 !=3D NULL) + if (!READ_ONCE(sysctl_netrom_routing_control) && ax25 !=3D NULL) return 0; =20 /* Its Time-To-Live has expired */ --=20 2.43.0