From e53da5fbfc02586fe4506ed583069b8205f3e38d Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Tue, 14 Oct 2014 17:02:37 -0400
Subject: [PATCH] net: Trap attempts to call sock_kfree_s() with a NULL
 pointer.

Unlike normal kfree() it is never right to call sock_kfree_s() with
a NULL pointer, because sock_kfree_s() also has the side effect of
discharging the memory from the sockets quota.

Signed-off-by: David S. Miller <davem@davemloft.net>
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