CVE-2023-52473

In the Linux kernel, the following vulnerability has been resolved:
thermal: core: Fix NULL pointer dereference in zone registration error path
If device_register() in thermal_zone_device_register_with_trips() returns
an error, the tz variable is set to NULL and subsequently dereferenced in
kfree(tz->tzp). Commit adc8749b150c (“thermal/drivers/core: Use
put_device() if device_register() fails”) added the tz = NULL assignment in
question to avoid a possible double-free after dropping the reference to
the zone device. However, after commit 4649620d9404 (“thermal: core: Make
thermal_zone_device_unregister() return after freeing the zone”), that
assignment has become redundant, because dropping the reference to the zone
device does not cause the zone object to be freed any more. Drop it to
address the NULL pointer dereference.

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