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ALSA: hda: Avoid NULL pointer dereference at snd_hdac_stream_start()

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For ca0132 codec, azx_dev->stream is NULL during firmware loading.
Calling snd_hdac_get_stream_stripe_ctl unconditionally causes NULL
pointer dereference in that function.

Fixes: 9b6f7e7a296e ("ALSA: hda: program stripe bits for controller")
Signed-off-by: Mariusz Ceier <mceier+kernel@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Mariusz Ceier 2019-03-11 21:53:57 +01:00 committed by Takashi Iwai
parent a634090a0f
commit d344e07940
1 changed files with 4 additions and 1 deletions
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5
sound/hda/hdac_stream.c
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@ -95,7 +95,10 @@ void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start)
1 << azx_dev->index,
1 << azx_dev->index);
/* set stripe control */
stripe_ctl = snd_hdac_get_stream_stripe_ctl(bus, azx_dev->substream);
if (azx_dev->substream)
stripe_ctl = snd_hdac_get_stream_stripe_ctl(bus, azx_dev->substream);
else
stripe_ctl = 0;
snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK,
stripe_ctl);
/* set DMA start and interrupt mask */