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    tcp: Fix a data-race around sysctl_tcp_retrans_collapse.
    Kuniyuki Iwashima authored and Yongqiang Liu committed 
    stable inclusion
from stable-v4.19.254
commit d4a90eb32681c79a140ff2600b52fce291cf4e91
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5Q0SQ


CVE: NA

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

[ Upstream commit 1a63cb91f0c2fcdeced6d6edee8d1d886583d139 ]

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

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
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>
    df1c2f93
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