Re: [PATCH] hwmon: (nct6775-core) Fix number of temperature registers for NCT6116

On 7/22/26 14:06, Florian Bezdeka wrote:
> On Wed, 2026-07-22 at 07:28 -0700, Guenter Roeck wrote:
>> Unlike NCT6106, NCT6116 only has three temperature registers, and with
>> it only three temperature source and temperature source configuration
>> registers. The register addresses match those of NCT6106 and can be
>> re-used.
>>
>> The code used a separate array to list the temperature source registers
>> for NCT6116, but used the size of the NCT6106 register array to set
>> the number of registers. The NCT6106 register array provides six addresses,
>> while the temperature source register array for NCT6116 only provides three
>> addresses. This causes a KASAN report.
>>
>> BUG: KASAN: global-out-of-bounds in nct6775_probe+0x936/0x46f0 [nct6775]
>> Read of size 2 at addr ffffffffc19561a6 by task modprobe/954
>> ...
>> Call Trace:
>>   dump_stack+0x7d/0xa7
>>   print_address_description.constprop.0+0x1c/0x220
>>   ? __kasan_kmalloc.constprop.0+0xc9/0xd0
>>   ? __kmalloc_node_track_caller+0x194/0x5b0
>>   ? nct6775_probe+0x936/0x46f0 [nct6775]
>>   ? nct6775_probe+0x936/0x46f0 [nct6775]
>> ...
>>
>> Fix the problem by hard-coding the number of temperature and temperature
>> configuration registers to three for NCT6116. Drop the unnecessary
>> NCT6116_REG_TEMP_SOURCE array and re-use NCT6106_REG_TEMP_SOURCE.
> 
> Thanks a lot for taking over and the super fast response/fix. Highly
> appreciated!
> 
> Have you checked how far we get with the auto-stable apply process? I'm
> expecting that 5.10 (and maybe 5.15 in addition) will need some manual
> backporting. Happy to help there, just let me know.
> 

Is anyone still using those old releases with that driver ?
I'd assume that would either be industrial systems or PC style
systems. For such systems, I would not want to be responsible for
all the unfixed security issues in them. A problem like this one
is really like trying to take care of a small broken leaf in
a forest of problems.

So, no, I don't plan to do any explicit backports to older kernels.
I would strongly suggest that anyone still on 5.10 or 5.15 based
kernels should consider switching to the most recent LTS kernel.

But, sure, please feel free to submit a backport to older kernels.

Thanks,
Guenter