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 ec_event_queue. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Benson Leung <ble...@chromium.org> Cc: Tzung-Bi Shih <tzun...@kernel.org> Cc: Dawei Li <set_pte...@outlook.com> Cc: Dmitry Torokhov <dmitry.torok...@gmail.com> Cc: Maximilian Luz <luzmaximil...@gmail.com> Cc: "Uwe Kleine-König" <u.kleine-koe...@pengutronix.de> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Cc: Jiang Jian <jiangj...@cdjrlc.com> Cc: chrome-platf...@lists.linux.dev Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/platform/chrome/wilco_ec/event.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/platform/chrome/wilco_ec/event.c b/drivers/platform/chrome/wilco_ec/event.c index a40f60bcefb6..f80a7c83cfba 100644 --- a/drivers/platform/chrome/wilco_ec/event.c +++ b/drivers/platform/chrome/wilco_ec/event.c @@ -95,7 +95,7 @@ struct ec_event_queue { int capacity; int head; int tail; - struct ec_event *entries[]; + struct ec_event *entries[] __counted_by(capacity); }; /* Maximum number of events to store in ec_event_queue */ -- 2.34.1
