From 8eec37d0e9039d5fbfc400324a06793b21ff24cd Mon Sep 17 00:00:00 2001
From: Mohamed Ghannam <simo.ghannam@gmail.com>
Date: Sun, 10 Dec 2017 03:50:58 +0000
Subject: [PATCH] net: ipv4: fix for a race condition in raw_sendmsg

commit 8f659a03a0ba9289b9aeb9b4470e6fb263d6f483 upstream.

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 3.2:
 - flowi4 flags don't depend on hdrincl
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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