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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-15 10:17:51 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-29 17:10:33 +0200 |
| commit | 0f75343584ee474303e17efe0610bdd170af1d13 (patch) | |
| tree | 51ec437540456fa977ab73e3129cd751d96c0a28 /include/net | |
| parent | f197442a0ea7fc0fa3103379d0be710664c76ba4 (diff) | |
| download | linux-stable-0f75343584ee474303e17efe0610bdd170af1d13.tar.gz linux-stable-0f75343584ee474303e17efe0610bdd170af1d13.tar.bz2 linux-stable-0f75343584ee474303e17efe0610bdd170af1d13.zip | |
tcp: Fix a data-race around sysctl_tcp_notsent_lowat.
[ Upstream commit 55be873695ed8912eb77ff46d1d1cadf028bd0f3 ]
While reading sysctl_tcp_notsent_lowat, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: c9bee3b7fdec ("tcp: TCP_NOTSENT_LOWAT socket option")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/tcp.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index f92b93cf074c..9b1bf1567861 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1876,7 +1876,7 @@ void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr); static inline u32 tcp_notsent_lowat(const struct tcp_sock *tp) { struct net *net = sock_net((struct sock *)tp); - return tp->notsent_lowat ?: net->ipv4.sysctl_tcp_notsent_lowat; + return tp->notsent_lowat ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat); } static inline bool tcp_stream_memory_free(const struct sock *sk) |