net: ipv4: fix for a race condition in raw_sendmsg

[ Upstream commit 8f659a03 ]

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

Change-Id: Ic3e4e1d3f6762e83db06c2bf52dd0923286ce2cc
Fixes: c008ba5b ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>