ipv6: use READ_ONCE() for inet->hdrincl as in ipv4
As it was done in commit 8f659a03 ("net: ipv4: fix for a race condition in raw_sendmsg") and commit 20b50d79 ("net: ipv4: emulate READ_ONCE() on ->hdrincl bit-field in raw_sendmsg()") for ipv4, copy the value of inet->hdrincl in a local variable, to avoid introducing a race condition in the next commit. Signed-off-by: Olivier Matz <olivier.matz@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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