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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2022-02-04 17:59:20 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2022-02-19 12:37:20 +0100 |
| commit | 8302532f47bb6c3aa1ed2043d30187ca307f176a (patch) | |
| tree | 1993cb506fa7e5abcf281c502d1f9163bd21e1c9 /drivers/i2c/i2c-core-smbus.c | |
| parent | 017b32e6da8d4a9673bf68ab4ac1260ef74e9695 (diff) | |
| download | linux-stable-8302532f47bb6c3aa1ed2043d30187ca307f176a.tar.gz linux-stable-8302532f47bb6c3aa1ed2043d30187ca307f176a.tar.bz2 linux-stable-8302532f47bb6c3aa1ed2043d30187ca307f176a.zip | |
i2c: smbus: Check for parent device before dereference
An I²C adapter might be instantiated without parent. In such case
there is no property can be retrieved. Skip SMBus alert setup when
this happens.
Fixes: a263a84088f6 ("i2c: smbus: Use device_*() functions instead of of_*()")
Reported-by: syzbot+0591ccf54ee05344e4eb@syzkaller.appspotmail.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c/i2c-core-smbus.c')
| -rw-r--r-- | drivers/i2c/i2c-core-smbus.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c index 053b215308c4..e3b96fc53b5c 100644 --- a/drivers/i2c/i2c-core-smbus.c +++ b/drivers/i2c/i2c-core-smbus.c @@ -705,10 +705,14 @@ EXPORT_SYMBOL_GPL(i2c_new_smbus_alert_device); #if IS_ENABLED(CONFIG_I2C_SMBUS) int i2c_setup_smbus_alert(struct i2c_adapter *adapter) { + struct device *parent = adapter->dev.parent; int irq; - irq = device_property_match_string(adapter->dev.parent, "interrupt-names", - "smbus_alert"); + /* Adapter instantiated without parent, skip the SMBus alert setup */ + if (!parent) + return 0; + + irq = device_property_match_string(parent, "interrupt-names", "smbus_alert"); if (irq == -EINVAL || irq == -ENODATA) return 0; else if (irq < 0) |