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| author | Jason Xing <kernelxing@tencent.com> | 2024-03-04 16:20:46 +0800 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2024-03-15 10:48:17 -0400 |
| commit | bbf950a6e96a91cf8cf0c71117b94ed3fafc9dd3 (patch) | |
| tree | 9956f40b565d77dada65c64b6b5b04573d3e975a | |
| parent | cfe0f73fb38a01bce86fe15ef5f750f850f7d3fe (diff) | |
| download | linux-bbf950a6e96a91cf8cf0c71117b94ed3fafc9dd3.tar.gz linux-bbf950a6e96a91cf8cf0c71117b94ed3fafc9dd3.tar.bz2 linux-bbf950a6e96a91cf8cf0c71117b94ed3fafc9dd3.zip | |
netrom: Fix data-races around sysctl_net_busy_read
[ Upstream commit d380ce70058a4ccddc3e5f5c2063165dc07672c6 ]
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 <kernelxing@tencent.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/netrom/af_netrom.c | 2 | ||||
| -rw-r--r-- | net/netrom/nr_in.c | 6 |
2 files changed, 4 insertions, 4 deletions
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index 376b6af43144..37d0bf6cab45 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -954,7 +954,7 @@ int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) * G8PZT's Xrouter which is sending packets with command type 7 * as an extension of the protocol. */ - if (sysctl_netrom_reset_circuit && + if (READ_ONCE(sysctl_netrom_reset_circuit) && (frametype != NR_RESET || flags != 0)) nr_transmit_reset(skb, 1); diff --git a/net/netrom/nr_in.c b/net/netrom/nr_in.c index 69e58906c32b..034f79d11ae1 100644 --- a/net/netrom/nr_in.c +++ b/net/netrom/nr_in.c @@ -97,7 +97,7 @@ static int nr_state1_machine(struct sock *sk, struct sk_buff *skb, break; case NR_RESET: - if (sysctl_netrom_reset_circuit) + if (READ_ONCE(sysctl_netrom_reset_circuit)) nr_disconnect(sk, ECONNRESET); break; @@ -128,7 +128,7 @@ static int nr_state2_machine(struct sock *sk, struct sk_buff *skb, break; case NR_RESET: - if (sysctl_netrom_reset_circuit) + if (READ_ONCE(sysctl_netrom_reset_circuit)) nr_disconnect(sk, ECONNRESET); break; @@ -263,7 +263,7 @@ static int nr_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype break; case NR_RESET: - if (sysctl_netrom_reset_circuit) + if (READ_ONCE(sysctl_netrom_reset_circuit)) nr_disconnect(sk, ECONNRESET); break; |