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leds: lm3697: Annotate struct lm3697 with __counted_by 

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 lm3697.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230915201010.never.399-kees@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Kees Cook 2023-09-15 13:10:10 -07:00 committed by Lee Jones
parent 52cd75108a
commit bcbadbb29c
1 changed files with 1 additions and 1 deletions
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2
drivers/leds/leds-lm3697.c
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@ -89,7 +89,7 @@ struct lm3697 {
int bank_cfg;
int num_banks;
struct lm3697_led leds[];
struct lm3697_led leds[] __counted_by(num_banks);
};
static const struct reg_default lm3697_reg_defs[] = {