staging/cxt1e1/linux.c: Correct arbitrary memory write in c4_ioctl()
The function c4_ioctl() writes data from user in ifr->ifr_data to the kernel struct data arg, without any iolen bounds checking. This can lead to a arbitrary write outside of the struct data arg. Corrected by adding bounds-checking of iolen before the copy_from_user(). Signed-off-by: NSalva Peiró <speiro@ai2.upv.es> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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