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 iqs62x_fw_blk. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Lee Jones <l...@kernel.org> Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/mfd/iqs62x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mfd/iqs62x.c b/drivers/mfd/iqs62x.c index e03b4d38fbb0..1b465590567c 100644 --- a/drivers/mfd/iqs62x.c +++ b/drivers/mfd/iqs62x.c @@ -96,7 +96,7 @@ struct iqs62x_fw_blk { u8 addr; u8 mask; u8 len; - u8 data[]; + u8 data[] __counted_by(len); }; struct iqs62x_info { -- 2.34.1
