rapidio/rio_cm: use memdup_user() instead of duplicating code

Fix coccinelle warning about duplicating existing memdup_user function.

Link: http://lkml.kernel.org/r/20160811151737.20140-1-alexandre.bounine@idt.com
Link: https://lkml.org/lkml/2016/8/11/29
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Barry Wood <barry.wood@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/rapidio/rio_cm.c b/drivers/rapidio/rio_cm.c
index 3fa17ac8df5492f4d2e4681d1a4f07f2f8defffa..3226983c2a1152a44372969d30e986bb97332d81 100644 (file)
--- a/drivers/rapidio/rio_cm.c
+++ b/drivers/rapidio/rio_cm.c
@@ -1841,24 +1841,19 @@ static int cm_chan_msg_send(void __user *arg)
 {
        struct rio_cm_msg msg;
        void *buf;
-       int ret = 0;
+       int ret;
 
        if (copy_from_user(&msg, arg, sizeof(msg)))
                return -EFAULT;
        if (msg.size > RIO_MAX_MSG_SIZE)
                return -EINVAL;
 
-       buf = kmalloc(msg.size, GFP_KERNEL);
-       if (!buf)
-               return -ENOMEM;
-
-       if (copy_from_user(buf, (void __user *)(uintptr_t)msg.msg, msg.size)) {
-               ret = -EFAULT;
-               goto out;
-       }
+       buf = memdup_user((void __user *)(uintptr_t)msg.msg, msg.size);
+       if (IS_ERR(buf))
+               return PTR_ERR(buf);
 
        ret = riocm_ch_send(msg.ch_num, buf, msg.size);
-out:
+
        kfree(buf);
        return ret;
 }