V4L/DVB: drivers/media: Use memdup_user

Use memdup_user when user data is immediately copied into the
allocated region.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
position p;
identifier l1,l2;
@@

-  to = \(kmalloc@p\|kzalloc@p\)(size,flag);
+  to = memdup_user(from,size);
   if (
-      to==NULL
+      IS_ERR(to)
                 || ...) {
   <+... when != goto l1;
-  -ENOMEM
+  PTR_ERR(to)
   ...+>
   }
-  if (copy_from_user(to, from, size) != 0) {
-    <+... when != goto l2;
-    -EFAULT
-    ...+>
-  }
// </smpl>

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

diff --git a/drivers/media/dvb/dvb-core/dvb_demux.c b/drivers/media/dvb/dvb-core/dvb_demux.c
index 977ddba..4a88a3e 100644 (file)
--- a/drivers/media/dvb/dvb-core/dvb_demux.c
+++ b/drivers/media/dvb/dvb-core/dvb_demux.c
@@ -1130,13 +1130,9 @@ static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t
        if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
                return -EINVAL;
 
-       p = kmalloc(count, GFP_USER);
-       if (!p)
-               return -ENOMEM;
-       if (copy_from_user(p, buf, count)) {
-               kfree(p);
-               return -EFAULT;
-       }
+       p = memdup_user(buf, count);
+       if (IS_ERR(p))
+               return PTR_ERR(p);
        if (mutex_lock_interruptible(&dvbdemux->mutex)) {
                kfree(p);
                return -ERESTARTSYS;

diff --git a/drivers/media/video/dabusb.c b/drivers/media/video/dabusb.c
index 0f50508..5b176bd 100644 (file)
--- a/drivers/media/video/dabusb.c
+++ b/drivers/media/video/dabusb.c
@@ -706,16 +706,11 @@ static long dabusb_ioctl (struct file *file, unsigned int cmd, unsigned long arg
        switch (cmd) {
 
        case IOCTL_DAB_BULK:
-               pbulk = kmalloc(sizeof (bulk_transfer_t), GFP_KERNEL);
+               pbulk = memdup_user((void __user *)arg,
+                                   sizeof(bulk_transfer_t));
 
-               if (!pbulk) {
-                       ret = -ENOMEM;
-                       break;
-               }
-
-               if (copy_from_user (pbulk, (void __user *) arg, sizeof (bulk_transfer_t))) {
-                       ret = -EFAULT;
-                       kfree (pbulk);
+               if (IS_ERR(pbulk)) {
+                       ret = PTR_ERR(pbulk);
                        break;
                }