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    • Gergo Koteles's avatar
      ALSA: hda/tas2781: leave hda_component in usable state · 75a25d31
      Gergo Koteles authored
      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: 5be27f1e ("ALSA: hda/tas2781: Add tas2781 HDA driver")
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarGergo Koteles <soyer@irl.hu>
      Link: https://lore.kernel.org/r/8b8ed2bd5f75fbb32e354a3226c2f966fa85b46b.1702156522.git.soyer@irl.huSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      75a25d31