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Input: evdev - annotate struct evdev_client 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 evdev_client.

[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/20230922175027.work.563-kees@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

authored by

Kees Cook and committed by
Dmitry Torokhov 8927e688 96609688

+1 -1
+1 -1
drivers/input/evdev.c
··· 50 50 bool revoked; 51 51 unsigned long *evmasks[EV_CNT]; 52 52 unsigned int bufsize; 53 - struct input_event buffer[]; 53 + struct input_event buffer[] __counted_by(bufsize); 54 54 }; 55 55 56 56 static size_t evdev_get_mask_cnt(unsigned int type)