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hwmon: (lm90) Only report alarms if driver is ready

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Only report alarms if driver is ready Userspace can read sysfs attributes before driver registration is complete, immediately after devm_hwmon_device_register_with_info() has been called. At that time, data->hwmon_dev is not yet initialized. This can trigger a NULL pointer access since lm90_update_device() and with it lm90_update_alarms_locked() will be called. This call schedules report_work and lm90_report_alarms(), which passes the still-NULL data->hwmon_dev to hwmon_notify_event() and triggers a NULL pointer dereference. Fix the problem by only scheduling the report and alert workers data->hwmon_dev is set.

Affected products

Linux
  • <4eed33c7db5c0c573928d28d8a2c003642c679b8
  • <075fce376cf852db9293481edce07c181a9b1f46
  • <6.0
  • ==6.0
  • <f0b791a006512a48b6348494cb6960598fa99a58
  • <aa9429edf9fc0e90d6f4da19ea4b5495a54ab117
  • =<6.6.*
  • =<*
  • <70d9a71aa407044d70b50d356b6decf6659c4d56
  • =<6.18.*
  • =<6.12.*
  • =<7.1.*