ALSA: line6: fix a crash in line6_hwdep_write()

The error checking here is messed up so we could end up dereferencing
-EFAULT.

Fixes: a16039cbf1a1 ('ALSA: line6: Add hwdep interface to access the POD control messages')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c
index 14e587e..90009c0 100644 (file)
--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -604,8 +604,8 @@ line6_hwdep_write(struct snd_hwdep *hwdep, const char __user *data, long count,
        }
 
        data_copy = memdup_user(data, count);
-       if (IS_ERR(ERR_PTR))
-               return -ENOMEM;
+       if (IS_ERR(data_copy))
+               return PTR_ERR(data_copy);
 
        rv = line6_send_raw_message(line6, data_copy, count);