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ALSA: hda/cs8409: Fix possible NULL dereference

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If snd_hda_gen_add_kctl fails to allocate memory and returns NULL, then
NULL pointer dereference will occur in the next line.

Since dolphin_fixups function is a hda_fixup function which is not supposed
to return any errors, add simple check before dereference, ignore the fail.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 20e5077241 ("ALSA: hda/cs8409: Add support for dolphin")
Signed-off-by: Murad Masimov <m.masimov@maxima.ru>
Link: https://patch.msgid.link/20241010221649.1305-1-m.masimov@maxima.ru
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Murad Masimov 2024-10-11 01:16:45 +03:00 committed by Takashi Iwai
parent ad6639f143
commit c9bd4a82b4
1 changed files with 3 additions and 2 deletions
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5
sound/pci/hda/patch_cs8409.c
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@ -1403,8 +1403,9 @@ void dolphin_fixups(struct hda_codec *codec, const struct hda_fixup *fix, int ac
kctrl = snd_hda_gen_add_kctl(&spec->gen, "Line Out Playback Volume",
&cs42l42_dac_volume_mixer);
/* Update Line Out kcontrol template */
kctrl->private_value = HDA_COMPOSE_AMP_VAL_OFS(DOLPHIN_HP_PIN_NID, 3, CS8409_CODEC1,
HDA_OUTPUT, CS42L42_VOL_DAC) | HDA_AMP_VAL_MIN_MUTE;
if (kctrl)
kctrl->private_value = HDA_COMPOSE_AMP_VAL_OFS(DOLPHIN_HP_PIN_NID, 3, CS8409_CODEC1,
HDA_OUTPUT, CS42L42_VOL_DAC) | HDA_AMP_VAL_MIN_MUTE;
cs8409_enable_ur(codec, 0);
snd_hda_codec_set_name(codec, "CS8409/CS42L42");
break;