This is a note to let you know that I've just added the patch titled
regulator: s5m8767: Bounds check id indexing into arrays
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
regulator-s5m8767-bounds-check-id-indexing-into-arra.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 866c1679a8c200a9f2759be736123935b7a31b83
Author: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Fri Jan 27 16:53:58 2023 -0800
regulator: s5m8767: Bounds check id indexing into arrays
[ Upstream commit e314e15a0b58f9d051c00b25951073bcdae61953 ]
The compiler has no way to know if "id" is within the array bounds of
the regulators array. Add a check for this and a build-time check that
the regulators and reg_voltage_map arrays are sized the same. Seen with
GCC 13:
../drivers/regulator/s5m8767.c: In function 's5m8767_pmic_probe':
../drivers/regulator/s5m8767.c:936:35: warning: array subscript [0, 36] is outside array bounds of 'struct regulator_desc[37]' [-Warray-bounds=]
936 | regulators[id].vsel_reg =
| ~~~~~~~~~~^~~~
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Cc: Liam Girdwood <lgirdwood@xxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230128005358.never.313-kees@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c
index 1e9f03a2ea1cc..7ff480810cfa2 100644
--- a/drivers/regulator/s5m8767.c
+++ b/drivers/regulator/s5m8767.c
@@ -924,10 +924,14 @@ static int s5m8767_pmic_probe(struct platform_device *pdev)
for (i = 0; i < pdata->num_regulators; i++) {
const struct sec_voltage_desc *desc;
- int id = pdata->regulators[i].id;
+ unsigned int id = pdata->regulators[i].id;
int enable_reg, enable_val;
struct regulator_dev *rdev;
+ BUILD_BUG_ON(ARRAY_SIZE(regulators) != ARRAY_SIZE(reg_voltage_map));
+ if (WARN_ON_ONCE(id >= ARRAY_SIZE(regulators)))
+ continue;
+
desc = reg_voltage_map[id];
if (desc) {
regulators[id].n_voltages =
