Hi Mark,
On 23/07/2023 01:26, Mark Brown wrote:
Unlike the other data structures provided during registration the
thermal core takes a copy of the thermal_zone_params provided to it and
stores that copy in the thermal_zone_device, taking care to free it on
unregistration. This is done because the parameters will be modified at
runtime.
Unfortunately the thermal_of code assumes that the params structure it
provides will be used throughout the lifetime of the device and since
the params are dynamically allocated based on the bindings it attempts
to free it on unregistration. This results in not only leaking the
original params but also double freeing the copy the core made, leading
to memory corruption.
Fix this by instead freeing the params parsed from the DT during
registration.
This issue causing instability on systems where thermal zones are
unregistered, especially visble on those systems where some zones
provided by a device have no trip points such as Allwinner systems.
For example with current mainline an arm64 defconfig is unbootable on
Pine64 Plus and LibreTech Tritium is massively unstable. These issues
have been there for a while and have been made more prominent by recent
memory management changes.
Fixes: 3fd6d6e2b4e80 ("thermal/of: Rework the thermal device tree initialization")
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
I think this issue has been fixed by:
https://lore.kernel.org/all/20230708112720.2897484-2-a.fatoum@xxxxxxxxxxxxxx/
Rafael ? Did you pick it up ?
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