diff options
| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2014-02-11 14:03:32 +0400 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2014-03-19 12:58:12 +0400 |
| commit | ad09dd6a1f5d6244bd89314015af506ba7f9810a (patch) | |
| tree | 38b2bf3583570997aa1a4bfb9af7ba90b7ca0a26 /drivers | |
| parent | 159ce52a6b777fc82fa0b51c7440e25f9e4c6feb (diff) | |
| download | linux-ad09dd6a1f5d6244bd89314015af506ba7f9810a.tar.xz | |
mfd: max77693: Fix possible NULL pointer dereference on i2c_new_dummy error
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.
Cc: stable@vger.kernel.org
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/max77693.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c index e0859987ab6b..c5535f018466 100644 --- a/drivers/mfd/max77693.c +++ b/drivers/mfd/max77693.c @@ -148,9 +148,18 @@ 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); /* @@ -184,8 +193,9 @@ 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; } |