tcp/dccp: Fix a data-race around sysctl_tcp_fwmark_accept.
While reading sysctl_tcp_fwmark_accept, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes: 84f39b08 ("net: support marking accepting TCP sockets") Signed-off-by: NKuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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