From nobody Fri Dec 19 19:15:49 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 4819314262B; Wed, 13 Mar 2024 16:42:55 +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=1710348175; cv=none; b=mp+wWBVS2/WkOMyfQFP/RetsHvnOWdJFtSmBWgx7v+h1PYYE816tRYqJOS8gaHuOhMWSD5vT/UnUOHYijnxO9QXnN+W8WtlwRTt4qs8M9vlH29KyLIUVozfKdMQnTNcrDqAq4N+kan4+wBQjhrEVlETrQ2SqAcEjP/44pes98Tk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710348175; c=relaxed/simple; bh=6/1EAGfa4zAXJ6ZaPmxIK8PFTioJivkuGr5IEuxC0DM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=le5DjEMW5Ed5HF1XK4ILMJYFi7t2/tKqB5yE37wcIOSV7ldMuQ1bMhSTaxNNDjNRXusPYLqD1ZqkMMQ2E7Y+k3v7EsIdbP5Xc3WUlqP/c4CmGr03Q/sxe66o7Z9Vc0sGw/Vr+n/LQCE4FXc1Rlaxp2L2dKfbWTooX0wkvI37jS8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=d5h+qGV3; 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="d5h+qGV3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70A79C43390; Wed, 13 Mar 2024 16:42:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710348175; bh=6/1EAGfa4zAXJ6ZaPmxIK8PFTioJivkuGr5IEuxC0DM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d5h+qGV3109rByx2IKOoqGuxJDvncs9nJvE6m50OegmvQPgx+jjexDvTnS1xhemq0 J1gcc3oLUXjXU/CJA+t4iMFnFQ2T9aY3u2OPBjLP8tMAMNvwFMGtWwCNj99RFfoatx DwGqeEDt4eV3g9FdLERjVN2ZB03K00mBjuGJxP9aqIzZ0pK0MABvLmYjLTKHLOn5Tq 4+gB2pIxl6EEWWyCag1YMjXfMbUiV0+7SQ0SnVNcVthDs+jiV0/y7uwCFgTqc+ZNml w/qsbxx8nI2tILQh8+i+etWTlwu3UrJ93DPU0TSGhvUoB5832FRPJeTV96/dy5OMPK WjmVo+iAwMtTQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jason Xing , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 26/76] netrom: Fix a data-race around sysctl_netrom_link_fails_count Date: Wed, 13 Mar 2024 12:41:33 -0400 Message-ID: <20240313164223.615640-27-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 bc76645ebdd01be9b9994dac39685a3d0f6f7985 ] 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 56bec5b5b37c7..983c5ad9724f1 100644 --- a/net/netrom/nr_route.c +++ b/net/netrom/nr_route.c @@ -728,7 +728,7 @@ void nr_link_failed(ax25_cb *ax25, int reason) nr_neigh->ax25 =3D NULL; ax25_cb_put(ax25); =20 - if (++nr_neigh->failed < sysctl_netrom_link_fails_count) { + if (++nr_neigh->failed < READ_ONCE(sysctl_netrom_link_fails_count)) { nr_neigh_put(nr_neigh); return; } --=20 2.43.0