net: ipv4: fix for a race condition in raw_sendmsg

net: ipv4: fix for a race condition in raw_sendmsg

inet->hdrincl is racy, and could lead to uninitialized stack pointer
usage, so its value should be read only once.

Fixes: c008ba5bdc9f ("ipv4: Avoid reading user iov twice after raw_probe_proto_opt")
Signed-off-by: Mohamed Ghannam <simo.ghannam@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 4.9: adjust context]

Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name net-ipv4-fix-for-a-race-condition-in-raw_sendmsg.patch