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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-20 09:50:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-03 12:03:48 +0200 |
| commit | 922ca9fd221ba4b74abeee94675dd04d1307b8dd (patch) | |
| tree | d0890ceb5f7f2dfc01040bc812ef5f224c6b2703 | |
| parent | 777d18e65d0901d5cb05c0497e359192279f0498 (diff) | |
| download | linux-stable-922ca9fd221ba4b74abeee94675dd04d1307b8dd.tar.gz linux-stable-922ca9fd221ba4b74abeee94675dd04d1307b8dd.tar.bz2 linux-stable-922ca9fd221ba4b74abeee94675dd04d1307b8dd.zip | |
tcp: Fix a data-race around sysctl_tcp_min_tso_segs.
[ Upstream commit e0bb4ab9dfddd872622239f49fb2bd403b70853b ]
While reading sysctl_tcp_min_tso_segs, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 95bd09eb2750 ("tcp: TSO packets automatic sizing")
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>
| -rw-r--r-- | net/ipv4/tcp_output.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 4389ad7e4c8c..51f31311fdb6 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1986,7 +1986,7 @@ static u32 tcp_tso_segs(struct sock *sk, unsigned int mss_now) min_tso = ca_ops->min_tso_segs ? ca_ops->min_tso_segs(sk) : - sock_net(sk)->ipv4.sysctl_tcp_min_tso_segs; + READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_min_tso_segs); tso_segs = tcp_tso_autosize(sk, mss_now, min_tso); return min_t(u32, tso_segs, sk->sk_gso_max_segs); |