tcp: Fix a data-race around sysctl_tcp_early_retrans.
authorKuniyuki Iwashima <kuniyu@amazon.com>
Mon, 18 Jul 2022 17:26:45 +0000 (10:26 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 29 Jul 2022 15:25:22 +0000 (17:25 +0200)
commit5037ca9e4b169cc9aed0174d658c3d81fdaf8ea5
treee2c9477fb4ee04f6dd69a9b17b7b1ae79dbca341
parent329de75b9e16104d5442319107ce3af961f2c96a
tcp: Fix a data-race around sysctl_tcp_early_retrans.

[ Upstream commit 52e65865deb6a36718a463030500f16530eaab74 ]

While reading sysctl_tcp_early_retrans, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

Fixes: eed530b6c676 ("tcp: early retransmit")
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>
net/ipv4/tcp_output.c