diff options
| author | Kees Cook <keescook@chromium.org> | 2023-01-28 01:52:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-11 18:26:43 +0300 |
| commit | 0afd3cc016f0964dfe5a60af2a6ad4675895b3de (patch) | |
| tree | ac6c188beae4fbc8203ec1e5161cec2c2273f40d /drivers | |
| parent | 6671c65168fbe7f7416f01254f15c845696444e4 (diff) | |
| download | linux-0afd3cc016f0964dfe5a60af2a6ad4675895b3de.tar.xz | |
regulator: max77802: Bounds check regulator id against opmode
[ Upstream commit 4fd8bcec5fd7c0d586206fa2f42bd67b06cdaa7e ]
Explicitly bounds-check the id before accessing the opmode array. Seen
with GCC 13:
../drivers/regulator/max77802-regulator.c: In function 'max77802_enable':
../drivers/regulator/max77802-regulator.c:217:29: warning: array subscript [0, 41] is outside array bounds of 'unsigned int[42]' [-Warray-bounds=]
217 | if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
| ~~~~~~~~~~~~~~~~^~~~
../drivers/regulator/max77802-regulator.c:62:22: note: while referencing 'opmode'
62 | unsigned int opmode[MAX77802_REG_MAX];
| ^~~~~~
Cc: Javier Martinez Canillas <javier@dowhile0.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20230127225203.never.864-kees@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/regulator/max77802-regulator.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/drivers/regulator/max77802-regulator.c b/drivers/regulator/max77802-regulator.c index b6261903818c..e12bab733e18 100644 --- a/drivers/regulator/max77802-regulator.c +++ b/drivers/regulator/max77802-regulator.c @@ -107,9 +107,11 @@ static int max77802_set_suspend_disable(struct regulator_dev *rdev) { unsigned int val = MAX77802_OFF_PWRREQ; struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev); - int id = rdev_get_id(rdev); + unsigned int id = rdev_get_id(rdev); int shift = max77802_get_opmode_shift(id); + if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode))) + return -EINVAL; max77802->opmode[id] = val; return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, rdev->desc->enable_mask, val << shift); @@ -123,7 +125,7 @@ static int max77802_set_suspend_disable(struct regulator_dev *rdev) static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode) { struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev); - int id = rdev_get_id(rdev); + unsigned int id = rdev_get_id(rdev); unsigned int val; int shift = max77802_get_opmode_shift(id); @@ -140,6 +142,9 @@ static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode) return -EINVAL; } + if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode))) + return -EINVAL; + max77802->opmode[id] = val; return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, rdev->desc->enable_mask, val << shift); @@ -148,8 +153,10 @@ static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode) static unsigned max77802_get_mode(struct regulator_dev *rdev) { struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev); - int id = rdev_get_id(rdev); + unsigned int id = rdev_get_id(rdev); + if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode))) + return -EINVAL; return max77802_map_mode(max77802->opmode[id]); } @@ -173,10 +180,13 @@ static int max77802_set_suspend_mode(struct regulator_dev *rdev, unsigned int mode) { struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev); - int id = rdev_get_id(rdev); + unsigned int id = rdev_get_id(rdev); unsigned int val; int shift = max77802_get_opmode_shift(id); + if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode))) + return -EINVAL; + /* * If the regulator has been disabled for suspend * then is invalid to try setting a suspend mode. @@ -222,9 +232,11 @@ static int max77802_set_suspend_mode(struct regulator_dev *rdev, static int max77802_enable(struct regulator_dev *rdev) { struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev); - int id = rdev_get_id(rdev); + unsigned int id = rdev_get_id(rdev); int shift = max77802_get_opmode_shift(id); + if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode))) + return -EINVAL; if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) max77802->opmode[id] = MAX77802_OPMODE_NORMAL; @@ -553,7 +565,7 @@ static int max77802_pmic_probe(struct platform_device *pdev) for (i = 0; i < MAX77802_REG_MAX; i++) { struct regulator_dev *rdev; - int id = regulators[i].id; + unsigned int id = regulators[i].id; int shift = max77802_get_opmode_shift(id); int ret; @@ -571,10 +583,12 @@ static int max77802_pmic_probe(struct platform_device *pdev) * the hardware reports OFF as the regulator operating mode. * Default to operating mode NORMAL in that case. */ - if (val == MAX77802_STATUS_OFF) - max77802->opmode[id] = MAX77802_OPMODE_NORMAL; - else - max77802->opmode[id] = val; + if (id < ARRAY_SIZE(max77802->opmode)) { + if (val == MAX77802_STATUS_OFF) + max77802->opmode[id] = MAX77802_OPMODE_NORMAL; + else + max77802->opmode[id] = val; + } rdev = devm_regulator_register(&pdev->dev, ®ulators[i], &config); |