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 atmel_nand. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Tudor Ambarus <tudor.amba...@linaro.org> Cc: Miquel Raynal <miquel.ray...@bootlin.com> Cc: Richard Weinberger <rich...@nod.at> Cc: Vignesh Raghavendra <vigne...@ti.com> Cc: Nicolas Ferre <nicolas.fe...@microchip.com> Cc: Alexandre Belloni <alexandre.bell...@bootlin.com> Cc: Claudiu Beznea <claudiu.bez...@tuxon.dev> Cc: linux-...@lists.infradead.org Cc: linux-arm-ker...@lists.infradead.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/mtd/nand/raw/atmel/nand-controller.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c index 3f494f7c7ecb..4cb478bbee4a 100644 --- a/drivers/mtd/nand/raw/atmel/nand-controller.c +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c @@ -165,7 +165,7 @@ struct atmel_nand { struct atmel_pmecc_user *pmecc; struct gpio_desc *cdgpio; int numcs; - struct atmel_nand_cs cs[]; + struct atmel_nand_cs cs[] __counted_by(numcs); }; static inline struct atmel_nand *to_atmel_nand(struct nand_chip *chip) -- 2.34.1
