ALSA: usb-audio: Always initialize fixed_rate in snd_usb_find_implicit_fb_sync_format()

commit 291e9da91403e0e628d7692b5ed505100e7b7706 upstream.

Handle the fallback code path, too.

Fixes: fd28941cff1c ("ALSA: usb-audio: Add new quirk FIXED_RATE for JBL Quantum810 Wireless")
BugLink: https://lore.kernel.org/alsa-devel/Y7frf3N%2FxzvESEsN@kili/
Reported-by: Dan Carpenter <error27@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230109141133.335543-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/usb/implicit.c b/sound/usb/implicit.c
index 41ac718..4727043 100644 (file)
--- a/sound/usb/implicit.c
+++ b/sound/usb/implicit.c
@@ -471,7 +471,7 @@ snd_usb_find_implicit_fb_sync_format(struct snd_usb_audio *chip,
        subs = find_matching_substream(chip, stream, target->sync_ep,
                                       target->fmt_type);
        if (!subs)
-               return sync_fmt;
+               goto end;
 
        high_score = 0;
        list_for_each_entry(fp, &subs->fmt_list, list) {
@@ -485,6 +485,7 @@ snd_usb_find_implicit_fb_sync_format(struct snd_usb_audio *chip,
                }
        }
 
+ end:
        if (fixed_rate)
                *fixed_rate = snd_usb_pcm_has_fixed_rate(subs);
        return sync_fmt;

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 99a66d0..d2c652a 100644 (file)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -163,6 +163,8 @@ bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *subs)
        struct snd_usb_audio *chip = subs->stream->chip;
        int rate = -1;
 
+       if (!subs)
+               return false;
        if (!(chip->quirk_flags & QUIRK_FLAG_FIXED_RATE))
                return false;
        list_for_each_entry(fp, &subs->fmt_list, list) {