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>

diff --git a/sound/core/control.c b/sound/core/control.c
index 4b20fa2..17b8d47 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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;