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ALSA: hda: fix possible NULL dereference

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After a for-loop was replaced by list_for_each_entry, see
Commit bbbc7e8502 ("ALSA: hda - Allocate hda_pcm objects dynamically"),
Commit 751e221689 ("ALSA: hda: fix possible null dereference"),
a possible NULL pointer dereference has been introduced; this patch adds
the NULL check on pcm->pcm, while leaving a potentially superfluous
check on pcm itself untouched.

Signed-off-by: Markus Osterhoff <linux-kernel@k-raum.org>
Cc: <stable@vger.kernel.org> #v4.1+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Markus Osterhoff 2015-08-24 14:11:39 +02:00 committed by Takashi Iwai
parent f6b28e4ded
commit c7e69ae6b4
1 changed files with 1 additions and 1 deletions
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2
sound/pci/hda/hda_codec.c
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@ -3172,7 +3172,7 @@ static int add_std_chmaps(struct hda_codec *codec)
struct snd_pcm_chmap *chmap;
const struct snd_pcm_chmap_elem *elem;
if (!pcm || pcm->own_chmap ||
if (!pcm || !pcm->pcm || pcm->own_chmap ||
!hinfo->substreams)
continue;
elem = hinfo->chmap ? hinfo->chmap : snd_pcm_std_chmaps;