ALSA: sound/core: 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>

5 files changed, 60 insertions, 99 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 4b20fa2b7e6d..17b8d47a5cd0 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 36d7a5998234..08bfed594a83 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 a151fb01ba82..fc6f98e257df 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 38693f47c262..c956fe462569 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 3f0050d0b71e..8f8b17ac074d 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;