media: tegra: camera: Fix stack overread

media: tegra: camera: Fix stack overread

We are not checking a variable which is user
controlled. This can lead to reading of the
stack data. Adding a check to ensure it is
less than the max possible value of the variable.

Bug 1763649

Change-Id: I395e882d030199bdd7684837906a9b5d60741650
Signed-off-by: Amey Asgaonkar <aasgaonkar@nvidia.com>
Signed-off-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-on: http://git-master/r/1150943
GVS: Gerrit_Virtual_Submit
Reviewed-by: Matthew Pedro <mapedro@nvidia.com>