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ALSA: usb-audio: Fix possible NULL pointer dereference in snd_usb_pcm_has_fixed_rate() 

The subs function argument may be NULL, so do not use it before the NULL check.

Fixes: 291e9da914 ("ALSA: usb-audio: Always initialize fixed_rate in snd_usb_find_implicit_fb_sync_format()")
Reported-by: coverity-bot <keescook@chromium.org>
Link: https://lore.kernel.org/alsa-devel/202301121424.4A79A485@keescook/
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230113085311.623325-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jaroslav Kysela 2023-01-13 09:53:11 +01:00 committed by Takashi Iwai
parent 84aa3059f4
commit 92a9c0ad86
1 changed files with 2 additions and 1 deletions
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3
sound/usb/pcm.c
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@ -160,11 +160,12 @@ find_substream_format(struct snd_usb_substream *subs,
bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *subs)
{
const struct audioformat *fp;
struct snd_usb_audio *chip = subs->stream->chip;
struct snd_usb_audio *chip;
int rate = -1;
if (!subs)
return false;
chip = subs->stream->chip;
if (!(chip->quirk_flags & QUIRK_FLAG_FIXED_RATE))
return false;
list_for_each_entry(fp, &subs->fmt_list, list) {