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Commit 79fc4e35 authored by Kuniyuki Iwashima's avatar Kuniyuki Iwashima Committed by Yongqiang Liu
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tcp: Fix data-races around sysctl_tcp_recovery.

stable inclusion
from stable-v4.19.254
commit c7a492db1f7c37c758a66915908677bd8bc5d368
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5Q0SQ


CVE: NA

--------------------------------

[ Upstream commit e7d2ef837e14a971a05f60ea08c47f3fed1a36e4 ]

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

Fixes: 4f41b1c5 ("tcp: use RACK to detect losses")
Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarYongqiang Liu <liuyongqiang13@huawei.com>
parent 1d8fb427
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