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    • Gergo Koteles's avatar
      ASoC: tas2781: check the validity of prm_no/cfg_no · f32c80d3
      Gergo Koteles authored
      Add additional checks for program/config numbers to avoid loading from
      invalid addresses.
      
      If prm_no/cfg_no is negative, skip uploading program/config.
      
      The tas2781-hda driver caused a NULL pointer dereference after loading
      module, and before first runtime_suspend.
      
      the state was:
      tas_priv->cur_conf = -1;
      tas_priv->tasdevice[i].cur_conf = 0;
      program = &(tas_fmw->programs[-1]);
      
      BUG: kernel NULL pointer dereference, address: 0000000000000010
      Call Trace:
       <TASK>
       ? __die+0x23/0x70
       ? page_fault_oops+0x171/0x4e0
       ? vprintk_emit+0x175/0x2b0
       ? exc_page_fault+0x7f/0x180
       ? asm_exc_page_fault+0x26/0x30
       ? tasdevice_load_block_kernel+0x21/0x310 [snd_soc_tas2781_fmwlib]
       tasdevice_select_tuningprm_cfg+0x268/0x3a0 [snd_soc_tas2781_fmwlib]
       tasdevice_tuning_switch+0x69/0x710 [snd_soc_tas2781_fmwlib]
       tas2781_hda_playback_hook+0xd4/0x110 [snd_hda_scodec_tas2781_i2c]
      
      Fixes: 915f5ead ("ASoC: tas2781: firmware lib")
      CC:  <stable@vger.kernel.org>
      Signed-off-by: default avatarGergo Koteles <soyer@irl.hu>
      Link: https://msgid.link/r/523780155bfdca9bc0acd39efc79ed039454818d.1702591356.git.soyer@irl.huSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      f32c80d3
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