[PATCH] alsa: fix error paths in snd_ctl_elem_add()

Fix bugs in error paths of snd_ctl_elem_add()
 - NULL reference
 - double free (already freed in snd_ctl_add())

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/sound/core/control.c b/sound/core/control.c
index abd62f9..0c29679 100644 (file)
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -959,17 +959,15 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
        kctl.private_free = snd_ctl_elem_user_free;
        _kctl = snd_ctl_new(&kctl, access);
        if (_kctl == NULL) {
-               kfree(_kctl->private_data);
+               kfree(ue);
                return -ENOMEM;
        }
        _kctl->private_data = ue;
        for (idx = 0; idx < _kctl->count; idx++)
                _kctl->vd[idx].owner = file;
        err = snd_ctl_add(card, _kctl);
-       if (err < 0) {
-               snd_ctl_free_one(_kctl);
+       if (err < 0)
                return err;
-       }
 
        down_write(&card->controls_rwsem);
        card->user_ctl_count++;