ALSA: sound/isa: use memdup_user()

Remove open-coded memdup_user().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/sb/sb16_csp.c

@@ -684,15 +684,16 @@ static int snd_sb_csp_load(struct snd_sb_csp * p, const unsigned char *buf, int
  
 static int snd_sb_csp_load_user(struct snd_sb_csp * p, const unsigned char __user *buf, int size, int load_flags)
 {
-	int err = -ENOMEM;
-	unsigned char *kbuf = kmalloc(size, GFP_KERNEL);
-	if (kbuf) {
-		if (copy_from_user(kbuf, buf, size))
-			err = -EFAULT;
-		else
-			err = snd_sb_csp_load(p, kbuf, size, load_flags);
-		kfree(kbuf);
-	}
+	int err;
+	unsigned char *kbuf;
+
+	kbuf = memdup_user(buf, size);
+	if (IS_ERR(kbuf))
+		return PTR_ERR(kbuf);
+
+	err = snd_sb_csp_load(p, kbuf, size, load_flags);
+
+	kfree(kbuf);
 	return err;
 }
 

sound/isa/wavefront/wavefront_fx.c

@@ -210,15 +210,11 @@ snd_wavefront_fx_ioctl (struct snd_hwdep *sdev, struct file *file,
 					    "> 512 bytes to FX\n");
 				return -EIO;
 			}
-			page_data = kmalloc(r.data[2] * sizeof(short), GFP_KERNEL);
-			if (!page_data)
-				return -ENOMEM;
-			if (copy_from_user (page_data,
-					    (unsigned char __user *) r.data[3],
-					    r.data[2] * sizeof(short))) {
-				kfree(page_data);
-				return -EFAULT;
-			}
+			page_data = memdup_user((unsigned char __user *)
+						r.data[3],
+						r.data[2] * sizeof(short));
+			if (IS_ERR(page_data))
+				return PTR_ERR(page_data);
 			pd = page_data;
 		}
 

sound/isa/wavefront/wavefront_synth.c

@@ -1664,12 +1664,11 @@ snd_wavefront_synth_ioctl (struct snd_hwdep *hw, struct file *file,
 		break;
 
 	case WFCTL_WFCMD:
-		wc = kmalloc(sizeof(*wc), GFP_KERNEL);
-		if (! wc)
-			return -ENOMEM;
-		if (copy_from_user (wc, argp, sizeof (*wc)))
-			err = -EFAULT;
-		else if (wavefront_synth_control (acard, wc) < 0)
+		wc = memdup_user(argp, sizeof(*wc));
+		if (IS_ERR(wc))
+			return PTR_ERR(wc);
+
+		if (wavefront_synth_control (acard, wc) < 0)
 			err = -EIO;
 		else if (copy_to_user (argp, wc, sizeof (*wc)))
 			err = -EFAULT;