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Subject[PATCH 4.19 12/41] netrom: Fix a data-race around sysctl_netrom_default_path_quality
Date
From: Jason Xing <kernelxing@tencent.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@tencent.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.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

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