linux-kernel - [PATCH] usb-audio: Check for possible chip NULL pointer before clearing probing flag

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Date:	Mon, 26 Sep 2011 15:43:59 +0200 (CEST)
From:	Thomas Pfaff <tpfaff@....net>
To:	tiwai@...e.de, gregkh@...e.de
cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: [PATCH] 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@....net>

---
diff -urp a/sound/usb/card.c b/sound/usb/card.c
--- a/sound/usb/card.c	2011-09-26 14:58:02.468672118 +0200
+++ b/sound/usb/card.c	2011-09-26 15:00:30.313110086 +0200
@@ -530,9 +530,11 @@ snd_usb_audio_probe(struct usb_device *d
 	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;
--
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