V4L/DVB: drivers/media/video/uvc: Use kmemdup

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

-  to = \(kmalloc\|kzalloc\)(size,flag);
+  to = kmemdup(from,size,flag);
   if (to==NULL || ...) S
-  memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 838b56f097cf..45aac1041862 100644
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -637,14 +637,13 @@ static int uvc_parse_streaming(struct uvc_device *dev,
         }
         streaming->header.bControlSize = n;
 
-        streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
+        streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
+                                                GFP_KERNEL);
         if (streaming->header.bmaControls == NULL) {
                 ret = -ENOMEM;
                 goto error;
         }
 
-        memcpy(streaming->header.bmaControls, &buffer[size], p*n);
-
         buflen -= buffer[0];
         buffer += buffer[0];