[PATCH 3.16 036/134] [media] cx231xx-audio: fix init error path

[Ben Hutchings]

3.16.47-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jo...@kernel.org>

commit fff1abc4d54e469140a699612b4db8d6397bfcba upstream.

Make sure to release the snd_card also on a late allocation error.

Fixes: e0d3bafd0258 ("V4L/DVB (10954): Add cx231xx USB driver")

Cc: Sri Deevi <srinivasa.de...@conexant.com>
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/drivers/media/usb/cx231xx/cx231xx-audio.c
+++ b/drivers/media/usb/cx231xx/cx231xx-audio.c
@@ -672,10 +672,8 @@ static int cx231xx_audio_init(struct cx2
 
        spin_lock_init(&adev->slock);
        err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
-       if (err < 0) {
-               snd_card_free(card);
-               return err;
-       }
+       if (err < 0)
+               goto err_free_card;
 
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
                        &snd_cx231xx_pcm_capture);
@@ -689,10 +687,9 @@ static int cx231xx_audio_init(struct cx2
        INIT_WORK(&dev->wq_trigger, audio_trigger);
 
        err = snd_card_register(card);
-       if (err < 0) {
-               snd_card_free(card);
-               return err;
-       }
+       if (err < 0)
+               goto err_free_card;
+
        adev->sndcard = card;
        adev->udev = dev->udev;
 
@@ -710,10 +707,10 @@ static int cx231xx_audio_init(struct cx2
        cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
                     adev->end_point_addr, adev->num_alt);
        adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
-
-       if (adev->alt_max_pkt_size == NULL) {
+       if (!adev->alt_max_pkt_size) {
                cx231xx_errdev("out of memory!\n");
-               return -ENOMEM;
+               err = -ENOMEM;
+               goto err_free_card;
        }
 
        for (i = 0; i < adev->num_alt; i++) {
@@ -727,6 +724,11 @@ static int cx231xx_audio_init(struct cx2
        }
 
        return 0;
+
+err_free_card:
+       snd_card_free(card);
+
+       return err;
 }
 
 static int cx231xx_audio_fini(struct cx231xx *dev)