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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: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kuniyuki Iwashima 2022-07-11 17:15:21 -07:00 committed by David S. Miller
parent 7d1025e559
commit 6f605b57f3
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/inet_timewait_sock.c
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@ -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,