Merge branch 'topic/memdup_user' into for-linus

* topic/memdup_user:
  ALSA: sound/pci: use memdup_user()
  ALSA: sound/usb: use memdup_user()
  ALSA: sound/isa: use memdup_user()
  ALSA: sound/core: use memdup_user()

11 files changed, 102 insertions, 165 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 4b20fa2..17b8d47 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -723,14 +723,11 @@ static int snd_ctl_elem_read_user(struct snd_card *card,
 {
 	struct snd_ctl_elem_value *control;
 	int result;
-	
-	control = kmalloc(sizeof(*control), GFP_KERNEL);
-	if (control == NULL)
-		return -ENOMEM;	
-	if (copy_from_user(control, _control, sizeof(*control))) {
-		kfree(control);
-		return -EFAULT;
-	}
+
+	control = memdup_user(_control, sizeof(*control));
+	if (IS_ERR(control))
+		return PTR_ERR(control);
+
 	snd_power_lock(card);
 	result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
 	if (result >= 0)
@@ -784,13 +781,10 @@ static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
 	struct snd_card *card;
 	int result;
 
-	control = kmalloc(sizeof(*control), GFP_KERNEL);
-	if (control == NULL)
-		return -ENOMEM;	
-	if (copy_from_user(control, _control, sizeof(*control))) {
-		kfree(control);
-		return -EFAULT;
-	}
+	control = memdup_user(_control, sizeof(*control));
+	if (IS_ERR(control))
+		return PTR_ERR(control);
+
 	card = file->card;
 	snd_power_lock(card);
 	result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
@@ -916,13 +910,10 @@ static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
 	if (op_flag > 0) {
 		if (size > 1024 * 128)	/* sane value */
 			return -EINVAL;
-		new_data = kmalloc(size, GFP_KERNEL);
-		if (new_data == NULL)
-			return -ENOMEM;
-		if (copy_from_user(new_data, tlv, size)) {
-			kfree(new_data);
-			return -EFAULT;
-		}
+
+		new_data = memdup_user(tlv, size);
+		if (IS_ERR(new_data))
+			return PTR_ERR(new_data);
 		change = ue->tlv_data_size != size;
 		if (!change)
 			change = memcmp(ue->tlv_data, new_data, size);
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
index 36d7a59..08bfed5 100644
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -232,14 +232,11 @@ static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
 	if (! (runtime = substream->runtime))
 		return -ENOTTY;
 
-	data = kmalloc(sizeof(*data), GFP_KERNEL);
-	if (data == NULL)
-		return -ENOMEM;
 	/* only fifo_size is different, so just copy all */
-	if (copy_from_user(data, data32, sizeof(*data32))) {
-		err = -EFAULT;
-		goto error;
-	}
+	data = memdup_user(data32, sizeof(*data32));
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
 	if (refine)
 		err = snd_pcm_hw_refine(substream, data);
 	else
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index a151fb0..fc6f98e 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -327,21 +327,16 @@ static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params;
 	int err;
 
-	params = kmalloc(sizeof(*params), GFP_KERNEL);
-	if (!params) {
-		err = -ENOMEM;
-		goto out;
-	}
-	if (copy_from_user(params, _params, sizeof(*params))) {
-		err = -EFAULT;
-		goto out;
-	}
+	params = memdup_user(_params, sizeof(*params));
+	if (IS_ERR(params))
+		return PTR_ERR(params);
+
 	err = snd_pcm_hw_refine(substream, params);
 	if (copy_to_user(_params, params, sizeof(*params))) {
 		if (!err)
 			err = -EFAULT;
 	}
-out:
+
 	kfree(params);
 	return err;
 }
@@ -465,21 +460,16 @@ static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params;
 	int err;
 
-	params = kmalloc(sizeof(*params), GFP_KERNEL);
-	if (!params) {
-		err = -ENOMEM;
-		goto out;
-	}
-	if (copy_from_user(params, _params, sizeof(*params))) {
-		err = -EFAULT;
-		goto out;
-	}
+	params = memdup_user(_params, sizeof(*params));
+	if (IS_ERR(params))
+		return PTR_ERR(params);
+
 	err = snd_pcm_hw_params(substream, params);
 	if (copy_to_user(_params, params, sizeof(*params))) {
 		if (!err)
 			err = -EFAULT;
 	}
-out:
+
 	kfree(params);
 	return err;
 }
@@ -2593,13 +2583,11 @@ static int snd_pcm_playback_ioctl1(struct file *file,
 			return -EFAULT;
 		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
 			return -EFAULT;
-		bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
-		if (bufs == NULL)
-			return -ENOMEM;
-		if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
-			kfree(bufs);
-			return -EFAULT;
-		}
+
+		bufs = memdup_user(xfern.bufs,
+				   sizeof(void *) * runtime->channels);
+		if (IS_ERR(bufs))
+			return PTR_ERR(bufs);
 		result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
 		kfree(bufs);
 		__put_user(result, &_xfern->result);
@@ -2675,13 +2663,11 @@ static int snd_pcm_capture_ioctl1(struct file *file,
 			return -EFAULT;
 		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
 			return -EFAULT;
-		bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
-		if (bufs == NULL)
-			return -ENOMEM;
-		if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
-			kfree(bufs);
-			return -EFAULT;
-		}
+
+		bufs = memdup_user(xfern.bufs,
+				   sizeof(void *) * runtime->channels);
+		if (IS_ERR(bufs))
+			return PTR_ERR(bufs);
 		result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
 		kfree(bufs);
 		__put_user(result, &_xfern->result);
@@ -3312,18 +3298,12 @@ static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
 	int err;
 
 	params = kmalloc(sizeof(*params), GFP_KERNEL);
-	if (!params) {
-		err = -ENOMEM;
-		goto out;
-	}
-	oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
-	if (!oparams) {
-		err = -ENOMEM;
-		goto out;
-	}
+	if (!params)
+		return -ENOMEM;
 
-	if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
-		err = -EFAULT;
+	oparams = memdup_user(_oparams, sizeof(*oparams));
+	if (IS_ERR(oparams)) {
+		err = PTR_ERR(oparams);
 		goto out;
 	}
 	snd_pcm_hw_convert_from_old_params(params, oparams);
@@ -3333,9 +3313,10 @@ static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
 		if (!err)
 			err = -EFAULT;
 	}
+
+	kfree(oparams);
 out:
 	kfree(params);
-	kfree(oparams);
 	return err;
 }
 
@@ -3347,17 +3328,12 @@ static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
 	int err;
 
 	params = kmalloc(sizeof(*params), GFP_KERNEL);
-	if (!params) {
-		err = -ENOMEM;
-		goto out;
-	}
-	oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
-	if (!oparams) {
-		err = -ENOMEM;
-		goto out;
-	}
-	if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
-		err = -EFAULT;
+	if (!params)
+		return -ENOMEM;
+
+	oparams = memdup_user(_oparams, sizeof(*oparams));
+	if (IS_ERR(oparams)) {
+		err = PTR_ERR(oparams);
 		goto out;
 	}
 	snd_pcm_hw_convert_from_old_params(params, oparams);
@@ -3367,9 +3343,10 @@ static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
 		if (!err)
 			err = -EFAULT;
 	}
+
+	kfree(oparams);
 out:
 	kfree(params);
-	kfree(oparams);
 	return err;
 }
 #endif /* CONFIG_SND_SUPPORT_OLD_API */
diff --git a/sound/core/seq/seq_compat.c b/sound/core/seq/seq_compat.c
index 38693f4..c956fe4 100644
--- a/sound/core/seq/seq_compat.c
+++ b/sound/core/seq/seq_compat.c
@@ -48,12 +48,11 @@ static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned
 	struct snd_seq_port_info *data;
 	mm_segment_t fs;
 
-	data = kmalloc(sizeof(*data), GFP_KERNEL);
-	if (! data)
-		return -ENOMEM;
+	data = memdup_user(data32, sizeof(*data32));
+	if (IS_ERR(data))
+		return PTR_ERR(data);
 
-	if (copy_from_user(data, data32, sizeof(*data32)) ||
-	    get_user(data->flags, &data32->flags) ||
+	if (get_user(data->flags, &data32->flags) ||
 	    get_user(data->time_queue, &data32->time_queue))
 		goto error;
 	data->kernel = NULL;
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 3f0050d..8f8b17a 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1395,13 +1395,10 @@ static int snd_timer_user_ginfo(struct file *file,
 	struct list_head *p;
 	int err = 0;
 
-	ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
-	if (! ginfo)
-		return -ENOMEM;
-	if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
-		kfree(ginfo);
-		return -EFAULT;
-	}
+	ginfo = memdup_user(_ginfo, sizeof(*ginfo));
+	if (IS_ERR(ginfo))
+		return PTR_ERR(ginfo);
+
 	tid = ginfo->tid;
 	memset(ginfo, 0, sizeof(*ginfo));
 	ginfo->tid = tid;
diff --git a/sound/isa/sb/sb16_csp.c b/sound/isa/sb/sb16_csp.c
index 49037d0..bdc8dde 100644
--- a/sound/isa/sb/sb16_csp.c
+++ b/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;
 }
 
diff --git a/sound/isa/wavefront/wavefront_fx.c b/sound/isa/wavefront/wavefront_fx.c
index a4345fc..2bb1cee 100644
--- a/sound/isa/wavefront/wavefront_fx.c
+++ b/sound/isa/wavefront/wavefront_fx.c
@@ -202,15 +202,11 @@ 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;
 		}
 
diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index beb312c..5d4ff48 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/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;
diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c
index 191e1cd..4b302d8 100644
--- a/sound/pci/emu10k1/emufx.c
+++ b/sound/pci/emu10k1/emufx.c
@@ -2493,24 +2493,17 @@ static int snd_emu10k1_fx8010_ioctl(struct snd_hwdep * hw, struct file *file, un
 	case SNDRV_EMU10K1_IOCTL_CODE_POKE:
 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
-		icode = kmalloc(sizeof(*icode), GFP_KERNEL);
-		if (icode == NULL)
-			return -ENOMEM;
-		if (copy_from_user(icode, argp, sizeof(*icode))) {
-			kfree(icode);
-			return -EFAULT;
-		}
+
+		icode = memdup_user(argp, sizeof(*icode));
+		if (IS_ERR(icode))
+			return PTR_ERR(icode);
 		res = snd_emu10k1_icode_poke(emu, icode);
 		kfree(icode);
 		return res;
 	case SNDRV_EMU10K1_IOCTL_CODE_PEEK:
-		icode = kmalloc(sizeof(*icode), GFP_KERNEL);
-		if (icode == NULL)
-			return -ENOMEM;
-		if (copy_from_user(icode, argp, sizeof(*icode))) {
-			kfree(icode);
-			return -EFAULT;
-		}
+		icode = memdup_user(argp, sizeof(*icode));
+		if (IS_ERR(icode))
+			return PTR_ERR(icode);
 		res = snd_emu10k1_icode_peek(emu, icode);
 		if (res == 0 && copy_to_user(argp, icode, sizeof(*icode))) {
 			kfree(icode);
@@ -2519,24 +2512,16 @@ static int snd_emu10k1_fx8010_ioctl(struct snd_hwdep * hw, struct file *file, un
 		kfree(icode);
 		return res;
 	case SNDRV_EMU10K1_IOCTL_PCM_POKE:
-		ipcm = kmalloc(sizeof(*ipcm), GFP_KERNEL);
-		if (ipcm == NULL)
-			return -ENOMEM;
-		if (copy_from_user(ipcm, argp, sizeof(*ipcm))) {
-			kfree(ipcm);
-			return -EFAULT;
-		}
+		ipcm = memdup_user(argp, sizeof(*ipcm));
+		if (IS_ERR(ipcm))
+			return PTR_ERR(ipcm);
 		res = snd_emu10k1_ipcm_poke(emu, ipcm);
 		kfree(ipcm);
 		return res;
 	case SNDRV_EMU10K1_IOCTL_PCM_PEEK:
-		ipcm = kzalloc(sizeof(*ipcm), GFP_KERNEL);
-		if (ipcm == NULL)
-			return -ENOMEM;
-		if (copy_from_user(ipcm, argp, sizeof(*ipcm))) {
-			kfree(ipcm);
-			return -EFAULT;
-		}
+		ipcm = memdup_user(argp, sizeof(*ipcm));
+		if (IS_ERR(ipcm))
+			return PTR_ERR(ipcm);
 		res = snd_emu10k1_ipcm_peek(emu, ipcm);
 		if (res == 0 && copy_to_user(argp, ipcm, sizeof(*ipcm))) {
 			kfree(ipcm);
diff --git a/sound/usb/usx2y/us122l.c b/sound/usb/usx2y/us122l.c
index 98276aa..012ff1f 100644
--- a/sound/usb/usx2y/us122l.c
+++ b/sound/usb/usx2y/us122l.c
@@ -349,14 +349,10 @@ static int usb_stream_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
 	if (cmd != SNDRV_USB_STREAM_IOCTL_SET_PARAMS)
 		return -ENOTTY;
 
-	cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
-	if (!cfg)
-		return -ENOMEM;
+	cfg = memdup_user((void *)arg, sizeof(*cfg));
+	if (IS_ERR(cfg))
+		return PTR_ERR(cfg);
 
-	if (copy_from_user(cfg, (void *)arg, sizeof(*cfg))) {
-		err = -EFAULT;
-		goto free;
-	}
 	if (cfg->version != USB_STREAM_INTERFACE_VERSION) {
 		err = -ENXIO;
 		goto free;
diff --git a/sound/usb/usx2y/usX2Yhwdep.c b/sound/usb/usx2y/usX2Yhwdep.c
index 4af8740..f3d8f71 100644
--- a/sound/usb/usx2y/usX2Yhwdep.c
+++ b/sound/usb/usx2y/usX2Yhwdep.c
@@ -203,13 +203,12 @@ static int snd_usX2Y_hwdep_dsp_load(struct snd_hwdep *hw,
 
 	if (access_ok(VERIFY_READ, dsp->image, dsp->length)) {
 		struct usb_device* dev = priv->chip.dev;
-		char *buf = kmalloc(dsp->length, GFP_KERNEL);
-		if (!buf)
-			return -ENOMEM;
-		if (copy_from_user(buf, dsp->image, dsp->length)) {
-			kfree(buf);
-			return -EFAULT;
-		}
+		char *buf;
+
+		buf = memdup_user(dsp->image, dsp->length);
+		if (IS_ERR(buf))
+			return PTR_ERR(buf);
+
 		err = usb_set_interface(dev, 0, 1);
 		if (err)
 			snd_printk(KERN_ERR "usb_set_interface error \n");