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authorKuniyuki Iwashima <kuniyu@amazon.com>2022-07-18 10:26:43 -0700
committerDavid S. Miller <davem@davemloft.net>2022-07-20 10:14:49 +0100
commit3d72bb4188c708bb16758c60822fc4dda7a95174 (patch)
treef799bca36a06cccad7bc3b26c6bd645b01e9aac6 /include
parent9b55c20f83369dd54541d9ddbe3a018a8377f451 (diff)
udp: Fix a data-race around sysctl_udp_l3mdev_accept.
While reading sysctl_udp_l3mdev_accept, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes: 63a6fff353d0 ("net: Avoid receiving packets with an l3mdev on unbound UDP sockets") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/udp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/udp.h b/include/net/udp.h
index bb4c227299cc..8dd4aa1485a6 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -238,7 +238,7 @@ static inline bool udp_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_udp_l3mdev_accept,
+ return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_udp_l3mdev_accept),
bound_dev_if, dif, sdif);
#else
return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);