raw: Fix a data-race around sysctl_raw_l3mdev_accept.

While reading sysctl_raw_l3mdev_accept, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

Fixes: be10a4ae41de ("net: provide a sysctl raw_l3mdev_accept for raw socket lookup with VRFs")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/raw.h b/include/net/raw.h
index 8ad8df5948536483c3467bff68ec0796b0712e67..c51a635671a73d57a4ad9f20fdebdafedf77116e 100644 (file)
--- a/include/net/raw.h
+++ b/include/net/raw.h
@@ -75,7 +75,7 @@ static inline bool raw_sk_bound_dev_eq(struct net *net, int bound_dev_if,
                                       int dif, int sdif)
 {
 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
-       return inet_bound_dev_eq(!!net->ipv4.sysctl_raw_l3mdev_accept,
+       return inet_bound_dev_eq(READ_ONCE(net->ipv4.sysctl_raw_l3mdev_accept),
                                 bound_dev_if, dif, sdif);
 #else
        return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);