regulator: mc13xxx: Annotate struct mc13xxx_regulator_priv 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 mc13xxx_regulator_priv.

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

Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230922175402.work.819-kees@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/mc13xxx.h b/drivers/regulator/mc13xxx.h
index e03279dc43f4efe818cd56f1026633d46034ad2e..057aaef6f0867d648b2ea19ac62fa7bc1c72eefb 100644 (file)
--- a/drivers/regulator/mc13xxx.h
+++ b/drivers/regulator/mc13xxx.h
@@ -24,7 +24,7 @@ struct mc13xxx_regulator_priv {
        u32 powermisc_pwgt_state;
        struct mc13xxx_regulator *mc13xxx_regulators;
        int num_regulators;
-       struct regulator_dev *regulators[];
+       struct regulator_dev *regulators[] __counted_by(num_regulators);
 };
 
 extern int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev,