5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
commit 8302532f47bb6c3aa1ed2043d30187ca307f176a upstream.
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@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/i2c-core-smbus.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- 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_de
#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)
