Re: [PATCH v3] ALSA: hda/tas2781: leave hda_component in usable state

[Takashi Iwai]

On Sat, 09 Dec 2023 22:18:29 +0100,
Gergo Koteles wrote:
> 
> Unloading then loading the module causes a NULL ponter dereference.
> 
> The hda_unbind zeroes the hda_component, later the hda_bind tries
> to dereference the codec field.
> 
> The hda_component is only initialized once by tas2781_generic_fixup.
> 
> Set only previously modified fields to NULL.
> 
> BUG: kernel NULL pointer dereference, address: 0000000000000322
> Call Trace:
>  <TASK>
>  ? __die+0x23/0x70
>  ? page_fault_oops+0x171/0x4e0
>  ? exc_page_fault+0x7f/0x180
>  ? asm_exc_page_fault+0x26/0x30
>  ? tas2781_hda_bind+0x59/0x140 [snd_hda_scodec_tas2781_i2c]
>  component_bind_all+0xf3/0x240
>  try_to_bring_up_aggregate_device+0x1c3/0x270
>  __component_add+0xbc/0x1a0
>  tas2781_hda_i2c_probe+0x289/0x3a0 [snd_hda_scodec_tas2781_i2c]
>  i2c_device_probe+0x136/0x2e0
> 
> Fixes: 5be27f1e3ec9 ("ALSA: hda/tas2781: Add tas2781 HDA driver")
> CC: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Gergo Koteles <soyer@xxxxxx>

Thanks, applied now.


Takashi