[PATCH] usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()

[Jeffin Philip]

On Mon, 17 Aug 2026 21:33:19 +0530, Jeffin Philip wrote:
>Kconfig currently sets the limit from 2 to 256 with default as 2. However,
>we use that only at build time. So, if we enter during runtime via configfs,
>we set page content to 0\0 and get the null pointer dereference. So we will
>need to add the check for num < 2 in fsg_opts_num_buffers_store() and return
>EINVAL? Upper bound is 256 which is below what kstrtou8() can return anyway.

Correction on the last sentence: Upper bound is 256 which is _above_ what 
kstrtou8() can return anyway.