ALSA: echoaudio - Eliminate use after free

Use the call to snd_card_free in the error handling code at the end of the
function, as in the other error cases.

A simplified version of the semantic patch that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E,E2;
@@

snd_card_free(E)
...
(
  E = E2
|
* E
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index 8dab82d..668a5ec 100644 (file)
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -2184,10 +2184,9 @@ static int __devinit snd_echo_probe(struct pci_dev *pci,
                        goto ctl_error;
 #endif
 
-       if ((err = snd_card_register(card)) < 0) {
-               snd_card_free(card);
+       err = snd_card_register(card);
+       if (err < 0)
                goto ctl_error;
-       }
        snd_printk(KERN_INFO "Card registered: %s\n", card->longname);
 
        pci_set_drvdata(pci, chip);