linux-kernel - [PATCH 4.19 12/41] netrom: Fix a data-race around sysctl_netrom_default_path

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Message-ID: <20240313170435.616724-13-sashal@kernel.org>
Date: Wed, 13 Mar 2024 13:04:06 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jason Xing <kernelxing@...cent.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 12/41] netrom: Fix a data-race around sysctl_netrom_default_path_quality

From: Jason Xing <kernelxing@...cent.com>

[ Upstream commit 958d6145a6d9ba9e075c921aead8753fb91c9101 ]

We need to protect the reader reading sysctl_netrom_default_path_quality
because the value can be changed concurrently.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Jason Xing <kernelxing@...cent.com>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 53ced34a1fdd2..e3ce3531608c4 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -156,7 +156,7 @@ static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
 		nr_neigh->digipeat = NULL;
 		nr_neigh->ax25     = NULL;
 		nr_neigh->dev      = dev;
-		nr_neigh->quality  = sysctl_netrom_default_path_quality;
+		nr_neigh->quality  = READ_ONCE(sysctl_netrom_default_path_quality);
 		nr_neigh->locked   = 0;
 		nr_neigh->count    = 0;
 		nr_neigh->number   = nr_neigh_no++;
-- 
2.43.0