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 hpets. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Clemens Ladisch <clem...@ladisch.de> Cc: Arnd Bergmann <a...@arndb.de> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/char/hpet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index 3b2159416e62..807c389510de 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -92,7 +92,7 @@ struct hpets { unsigned long hp_delta; unsigned int hp_ntimer; unsigned int hp_which; - struct hpet_dev hp_dev[]; + struct hpet_dev hp_dev[] __counted_by(hp_ntimer); }; static struct hpets *hpets; -- 2.34.1
