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netrom: Fix data-races around sysctl_net_busy_read

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

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jason Xing 2024-03-04 16:20:46 +08:00 • committed by Paolo Abeni
parent bc76645ebd
commit d380ce7005
2 changed files with 4 additions and 4 deletions
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2
net/netrom/af_netrom.c
View file

@ -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);

6
net/netrom/nr_in.c
View file

@ -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;
@ -262,7 +262,7 @@ 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;