ALSA: usb-audio: Check for possible chip NULL pointer before clearing probing flag

Before clearing the probing flag in the error exit path, check that the
chip pointer is not NULL.

Signed-off-by: Thomas Pfaff <tpfaff@gmx.net>
Cc: <stable@kernel.org> [2.6.39+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 5 insertions, 3 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
index ed120ca2353d..d8f2bf401458 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -530,9 +530,11 @@ snd_usb_audio_probe(struct usb_device *dev,
         return chip;
 
  __error:
-        if (chip && !chip->num_interfaces)
-                snd_card_free(chip->card);
-        chip->probing = 0;
+        if (chip) {
+                if (!chip->num_interfaces)
+                        snd_card_free(chip->card);
+                chip->probing = 0;
+        }
         mutex_unlock(&register_mutex);
  __err_val:
         return NULL;