| From | Luis Henriques <> | Subject | [PATCH 3.11 075/182] mfd: max77693: Fix possible NULL pointer dereference on i2c_new_dummy error | Date | Thu, 24 Apr 2014 09:50:00 +0100 |
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3.11.10.9 -stable review patch. If anyone has any objections, please let me know.
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From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
commit ad09dd6a1f5d6244bd89314015af506ba7f9810a upstream.
During probe the driver allocates dummy I2C devices for MUIC and haptic with i2c_new_dummy() but it does not check the return value of this calls.
In case of error (i2c_new_device(): memory allocation failure or I2C address cannot be used) this function returns NULL which is later used by devm_regmap_init_i2c() and i2c_unregister_device().
If i2c_new_dummy() fails for MUIC or haptic devices, fail also the probe for main MFD driver.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/mfd/max77693.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c index 9e60fed..299970f 100644 --- a/drivers/mfd/max77693.c +++ b/drivers/mfd/max77693.c @@ -149,9 +149,18 @@ static int max77693_i2c_probe(struct i2c_client *i2c, dev_info(max77693->dev, "device ID: 0x%x\n", reg_data); max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC); + if (!max77693->muic) { + dev_err(max77693->dev, "Failed to allocate I2C device for MUIC\n"); + return -ENODEV; + } i2c_set_clientdata(max77693->muic, max77693); max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC); + if (!max77693->haptic) { + dev_err(max77693->dev, "Failed to allocate I2C device for Haptic\n"); + ret = -ENODEV; + goto err_i2c_haptic; + } i2c_set_clientdata(max77693->haptic, max77693); /* @@ -187,8 +196,9 @@ err_mfd: max77693_irq_exit(max77693); err_irq: err_regmap_muic: - i2c_unregister_device(max77693->muic); i2c_unregister_device(max77693->haptic); +err_i2c_haptic: + i2c_unregister_device(max77693->muic); return ret; } -- 1.9.1
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