ALSA: hda: Fix possible null-ptr-deref when assigning a stream
While AudioDSP drivers assign streams exclusively of HOST or LINK type, nothing blocks a user to attempt to assign a COUPLED stream. As supplied substream instance may be a stub, what is the case when code-loading, such scenario ends with null-ptr-deref. Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com> Link: https://lore.kernel.org/r/20231006102857.749143-2-cezary.rojewski@intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -362,8 +362,10 @@ struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
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struct hdac_stream *res = NULL;
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/* make a non-zero unique key for the substream */
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int key = (substream->pcm->device << 16) | (substream->number << 2) |
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(substream->stream + 1);
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int key = (substream->number << 2) | (substream->stream + 1);
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if (substream->pcm)
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key |= (substream->pcm->device << 16);
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spin_lock_irq(&bus->reg_lock);
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list_for_each_entry(azx_dev, &bus->stream_list, list) {
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