ip: Fix data-races around sysctl_ip_fwd_use_pmtu.
stable inclusion from stable-v4.19.254 commit eb15262128b793e4b1d1c4514d3e6d19c3959764 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5Q0SQ CVE: NA -------------------------------- [ Upstream commit 60c158dc7b1f0558f6cadd5b50d0386da0000d50 ] While reading sysctl_ip_fwd_use_pmtu, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: f87c10a8 ("ipv4: introduce ip_dst_mtu_maybe_forward and protect forwarding path against pmtu spoofing") 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> Signed-off-by:
Yongqiang Liu <liuyongqiang13@huawei.com>
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