kcm: return immediately after copy_from_user() failure
authorWANG Cong <xiyou.wangcong@gmail.com>
Thu, 23 Mar 2017 18:03:31 +0000 (11:03 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 3 May 2017 15:36:34 +0000 (08:36 -0700)
commitd60d4e8c1b73608b6af3bc384e88c062485fd95e
treef47b006a7304e7323bfc9b218d02bfdd718df1ac
parentc63d6180076bbb6c5a508910e573994ddc628e5b
kcm: return immediately after copy_from_user() failure

[ Upstream commit a80db69e47d764bbcaf2fec54b1f308925e7c490 ]

There is no reason to continue after a copy_from_user()
failure.

Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module")
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/kcm/kcmsock.c