[um] hostaudio: don't open-code memdup_user()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 3 insertions, 7 deletions

diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
index f6b911cc3923..3a4b58730f5f 100644
--- a/arch/um/drivers/hostaudio_kern.c
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -105,13 +105,9 @@ static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
         printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
 #endif
 
-        kbuf = kmalloc(count, GFP_KERNEL);
-        if (kbuf == NULL)
-                return -ENOMEM;
-
-        err = -EFAULT;
-        if (copy_from_user(kbuf, buffer, count))
-                goto out;
+        kbuf = memdup_user(buffer, count);
+        if (IS_ERR(kbuf))
+                return PTR_ERR(kbuf);
 
         err = os_write_file(state->fd, kbuf, count);
         if (err < 0)