In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Use...

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_ncm: Use unsigned int for ndp_index

The variable ndp_index is declared as a signed integer, but it stores the return value of get_ncm(), which is unsigned.

A malicious host can supply a large offset that overflows the signed ndp_index, making it negative. Because ndp_index is compared against unsigned bounds, this negative value bypasses sanity checks and leads to an out-of-bounds read when calculating the address of the NDP block (ntb_ptr + ndp_index).

Fix this by changing ndp_index to unsigned int to ensure consistent unsigned comparisons throughout the function.