ALSA: sound/pci: 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>

1 files changed, 13 insertions, 28 deletions

diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c
index 191e1cd9997..4b302d86f5f 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);