From: Paolo Abeni <pabeni@redhat.com>
Date: Wed, 23 Aug 2017 11:57:51 +0200
Subject: net/sock: allow the user to set negative peek offset
Patch-mainline: v4.14-rc1
Git-commit: 257a73031d29447ee82fe06d2b97d8564f63276d
References: bsc#1056787

This is necessary to allow the user to disable peeking with
offset once it's enabled.
Unix sockets already allow the above, with this patch we
permit it for udp[6] sockets, too.

Fixes: 627d2d6b5500 ("udp: enable MSG_PEEK at non-zero offset")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/core/sock.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2355,9 +2355,6 @@ EXPORT_SYMBOL(__sk_mem_reclaim);
 
 int sk_set_peek_off(struct sock *sk, int val)
 {
-	if (val < 0)
-		return -EINVAL;
-
 	sk->sk_peek_off = val;
 	return 0;
 }