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hwmon: Annotate struct gsc_hwmon_platform_data with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct gsc_hwmon_platform_data.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175053.work.564-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>

Kees Cook 4a530cb9 cfa36f88

+1 -1
+1 -1
include/linux/platform_data/gsc_hwmon.h
··· 40 40 unsigned int resolution; 41 41 unsigned int vreference; 42 42 unsigned int fan_base; 43 - struct gsc_hwmon_channel channels[]; 43 + struct gsc_hwmon_channel channels[] __counted_by(nchannels); 44 44 }; 45 45 #endif