kernel: HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()

A flaw exists in the Linux kernel’s HID multitouch driver function mtreportfixup in drivers/hid/hid-multitouch.c. A malicious HID device may supply a report descriptor smaller than 607 bytes; the function then attempts to access and patch byte offset 607 without first verifying the descriptor...