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Subject[PATCH] regulator: tps65910: Fix array access out of bounds bug
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For tps65910, the number of regulator is 13. ( ARRAY_SIZE(tps65910_regs) is 13)
For tps65911, the number of regulator is 12. ( ARRAY_SIZE(tps65911_regs) is 12)
If we are using this driver for tps65911,
we hit array access out of bounds bug in tps65910_probe() because
current implementation always assume the number of regulator is 13 and
thus it will access tps65911_regs[12].

Fix it by setting correct num_regulators for both chips in tps65910_probe(),
and allocated neccessay memory accordingly.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
hi Graeme, Jorge,
I don't have this hardware and cannot test it.
I appreciate if you can help to test this patch.

Regards,
Axel

drivers/regulator/tps65910-regulator.c | 55 +++++++++++++++++++++++++-------
1 files changed, 43 insertions(+), 12 deletions(-)

diff --git a/drivers/regulator/tps65910-regulator.c b/drivers/regulator/tps65910-regulator.c
index 8e0edab..66d2d60 100644
--- a/drivers/regulator/tps65910-regulator.c
+++ b/drivers/regulator/tps65910-regulator.c
@@ -49,7 +49,6 @@
#define TPS65911_REG_LDO7 11
#define TPS65911_REG_LDO8 12

-#define TPS65910_NUM_REGULATOR 13
#define TPS65910_SUPPLY_STATE_ENABLED 0x1

/* supported VIO voltages in milivolts */
@@ -264,11 +263,12 @@ static struct tps_info tps65911_regs[] = {
};

struct tps65910_reg {
- struct regulator_desc desc[TPS65910_NUM_REGULATOR];
+ struct regulator_desc *desc;
struct tps65910 *mfd;
- struct regulator_dev *rdev[TPS65910_NUM_REGULATOR];
- struct tps_info *info[TPS65910_NUM_REGULATOR];
+ struct regulator_dev **rdev;
+ struct tps_info **info;
struct mutex mutex;
+ int num_regulators;
int mode;
int (*get_ctrl_reg)(int);
};
@@ -902,10 +902,12 @@ static __devinit int tps65910_probe(struct platform_device *pdev)
switch(tps65910_chip_id(tps65910)) {
case TPS65910:
pmic->get_ctrl_reg = &tps65910_get_ctrl_register;
+ pmic->num_regulators = ARRAY_SIZE(tps65910_regs);
info = tps65910_regs;
break;
case TPS65911:
pmic->get_ctrl_reg = &tps65911_get_ctrl_register;
+ pmic->num_regulators = ARRAY_SIZE(tps65911_regs);
info = tps65911_regs;
break;
default:
@@ -914,7 +916,28 @@ static __devinit int tps65910_probe(struct platform_device *pdev)
return -ENODEV;
}

- for (i = 0; i < TPS65910_NUM_REGULATOR; i++, info++, reg_data++) {
+ pmic->desc = kcalloc(pmic->num_regulators,
+ sizeof(struct regulator_desc), GFP_KERNEL);
+ if (!pmic->desc) {
+ err = -ENOMEM;
+ goto err_free_pmic;
+ }
+
+ pmic->info = kcalloc(pmic->num_regulators,
+ sizeof(struct tps_info *), GFP_KERNEL);
+ if (!pmic->info) {
+ err = -ENOMEM;
+ goto err_free_desc;
+ }
+
+ pmic->rdev = kcalloc(pmic->num_regulators,
+ sizeof(struct regulator_dev *), GFP_KERNEL);
+ if (!pmic->rdev) {
+ err = -ENOMEM;
+ goto err_free_info;
+ }
+
+ for (i = 0; i < pmic->num_regulators; i++, info++, reg_data++) {
/* Register the regulators */
pmic->info[i] = info;

@@ -946,7 +969,7 @@ static __devinit int tps65910_probe(struct platform_device *pdev)
"failed to register %s regulator\n",
pdev->name);
err = PTR_ERR(rdev);
- goto err;
+ goto err_unregister_regulator;
}

/* Save regulator for cleanup */
@@ -954,23 +977,31 @@ static __devinit int tps65910_probe(struct platform_device *pdev)
}
return 0;

-err:
+err_unregister_regulator:
while (--i >= 0)
regulator_unregister(pmic->rdev[i]);
-
+ kfree(pmic->rdev);
+err_free_info:
+ kfree(pmic->info);
+err_free_desc:
+ kfree(pmic->desc);
+err_free_pmic:
kfree(pmic);
return err;
}

static int __devexit tps65910_remove(struct platform_device *pdev)
{
- struct tps65910_reg *tps65910_reg = platform_get_drvdata(pdev);
+ struct tps65910_reg *pmic = platform_get_drvdata(pdev);
int i;

- for (i = 0; i < TPS65910_NUM_REGULATOR; i++)
- regulator_unregister(tps65910_reg->rdev[i]);
+ for (i = 0; i < pmic->num_regulators; i++)
+ regulator_unregister(pmic->rdev[i]);

- kfree(tps65910_reg);
+ kfree(pmic->rdev);
+ kfree(pmic->info);
+ kfree(pmic->desc);
+ kfree(pmic);
return 0;
}

--
1.7.4.1




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