> gdth_ioctl_alloc() takes the size variable as an int.
> copy_from_user() takes the size variable as an unsigned long.
> gen.data_len and gen.sense_len are unsigned longs.
> On x86_64 longs are 64 bit and ints are 32 bit.
>
> We could pass in a very large number and the allocation would truncate
> the size to 32 bits and allocate a small buffer. Then when we do the
> copy_from_user(), it would result in a memory corruption.
>
> CC:
stable@kernel.org
> Signed-off-by: Dan Carpenter <error27@gmail.com>
>
