media: video: tegra: fix sh532u buffer overflows

media: video: tegra: fix sh532u buffer overflows

We need to validate the buffer size before we
copy buffers from/to user space.

Bug 1027334

Change-Id: I0717e9ff1d2e5eb3e8a863555457f4bcfdbb2cb9
Signed-off-by: Frank Chen <frankc@nvidia.com>
Reviewed-on: http://git-master/r/120185
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Charlie Huang <chahuang@nvidia.com>
Reviewed-by: Patrick Shehane <pshehane@nvidia.com>
Reviewed-by: Dan Willemsen <dwillemsen@nvidia.com>
Rebase-Id: Rbe420ed11864431ca8bc7597373ca27bca950c50