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Input: mt - annotate struct input_mt 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 input_mt.

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

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175036.work.762-kees@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

authored by

Kees Cook and committed by
Dmitry Torokhov 348cbf98 21d7ec79

+1 -1
+1 -1
include/linux/input/mt.h
··· 47 47 unsigned int flags; 48 48 unsigned int frame; 49 49 int *red; 50 - struct input_mt_slot slots[]; 50 + struct input_mt_slot slots[] __counted_by(num_slots); 51 51 }; 52 52 53 53 static inline void input_mt_set_value(struct input_mt_slot *slot,