V4L/DVB (3488): Snd_cx88_create: don't dereference NULL core

If the call to cx88_core_get returns a NULL value, it is dereferenced
by cx88_reset, and perhaps by cx88_core_put.  Spotted by the Coverity
checker.

Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/cx88/cx88-alsa.c b/drivers/media/video/cx88/cx88-alsa.c
index 2acccd6..bffef1d 100644 (file)
--- a/drivers/media/video/cx88/cx88-alsa.c
+++ b/drivers/media/video/cx88/cx88-alsa.c
@@ -672,6 +672,11 @@ static int __devinit snd_cx88_create(snd_card_t *card, struct pci_dev *pci,
        chip = (snd_cx88_card_t *) card->private_data;
 
        core = cx88_core_get(pci);
+       if (NULL == core) {
+               err = -EINVAL;
+               kfree (chip);
+               return err;
+       }
 
        if (!pci_dma_supported(pci,0xffffffff)) {
                dprintk(0, "%s/1: Oops: no 32bit PCI DMA ???\n",core->name);
@@ -688,11 +693,6 @@ static int __devinit snd_cx88_create(snd_card_t *card, struct pci_dev *pci,
        spin_lock_init(&chip->reg_lock);
 
        cx88_reset(core);
-       if (NULL == core) {
-               err = -EINVAL;
-               kfree (chip);
-               return err;
-       }
        chip->core = core;
 
        /* get irq */