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 axp20x_usb_power. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Sebastian Reichel <[email protected]> Cc: Chen-Yu Tsai <[email protected]> Cc: [email protected] Signed-off-by: Kees Cook <[email protected]> --- drivers/power/supply/axp20x_usb_power.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c index bde17406c130..e23308ad4cc7 100644 --- a/drivers/power/supply/axp20x_usb_power.c +++ b/drivers/power/supply/axp20x_usb_power.c @@ -73,7 +73,7 @@ struct axp20x_usb_power { unsigned int old_status; unsigned int online; unsigned int num_irqs; - unsigned int irqs[]; + unsigned int irqs[] __counted_by(num_irqs); }; static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power) -- 2.34.1
