iovec: make sure the caller actually wants anything in memcpy_fromiovecend
authorSasha Levin <sasha.levin@oracle.com>
Fri, 1 Aug 2014 03:00:35 +0000 (23:00 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 14 Aug 2014 01:24:15 +0000 (09:24 +0800)
commit9d868b94a6f52a17a2a94b34e544800d741b7852
treea6866ca3e46189b91d66556fa9d0281912eaf7b0
parentc290a4ef1fe38bd8d29573468a189e49dbaa0681
iovec: make sure the caller actually wants anything in memcpy_fromiovecend

[ Upstream commit 06ebb06d49486676272a3c030bfeef4bd969a8e6 ]

Check for cases when the caller requests 0 bytes instead of running off
and dereferencing potentially invalid iovecs.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/core/iovec.c