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authorKuniyuki Iwashima <kuniyu@amazon.com>2022-07-12 02:15:21 +0200
committerDavid S. Miller <davem@davemloft.net>2022-07-13 13:56:49 +0200
commit6f605b57f3782114e330e108ce1903ede22ec675 (patch)
tree762f1a37b0bd207f332e9dd4ff310a8319da0702 /net/ipv4/inet_timewait_sock.c
parentsysctl: Fix data-races in proc_dointvec_ms_jiffies(). (diff)
downloadlinux-6f605b57f3782114e330e108ce1903ede22ec675.tar.xz
linux-6f605b57f3782114e330e108ce1903ede22ec675.zip
tcp: Fix a data-race around sysctl_max_tw_buckets.
While reading sysctl_max_tw_buckets, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_timewait_sock.c')
-rw-r--r--net/ipv4/inet_timewait_sock.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 0ec501845cb3..47ccc343c9fb 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -156,7 +156,8 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
{
struct inet_timewait_sock *tw;
- if (refcount_read(&dr->tw_refcount) - 1 >= dr->sysctl_max_tw_buckets)
+ if (refcount_read(&dr->tw_refcount) - 1 >=
+ READ_ONCE(dr->sysctl_max_tw_buckets))
return NULL;
tw = kmem_cache_alloc(sk->sk_prot_creator->twsk_prot->twsk_slab,