drivers/block: use memdup_user
Julia Lawall [Wed, 21 Jul 2010 02:08:59 +0000 (20:08 -0600)]
Use memdup_user when user data is immediately copied into the
allocated region.  Some checkpatch cleanups in nearby code.

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>
Cc: Chirag Kantharia <chirag.kantharia@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

drivers/block/cpqarray.c

index 28937b6..9473215 100644 (file)
@@ -1255,17 +1255,11 @@ static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io)
        /* Pre submit processing */
        switch(io->cmd) {
        case PASSTHRU_A:
-               p = kmalloc(io->sg[0].size, GFP_KERNEL);
-               if (!p) 
-               { 
-                       error = -ENOMEM; 
-                       cmd_free(h, c, 0); 
-                       return(error);
-               }
-               if (copy_from_user(p, io->sg[0].addr, io->sg[0].size)) {
-                       kfree(p);
-                       cmd_free(h, c, 0); 
-                       return -EFAULT;
+               p = memdup_user(io->sg[0].addr, io->sg[0].size);
+               if (IS_ERR(p)) {
+                       error = PTR_ERR(p);
+                       cmd_free(h, c, 0);
+                       return error;
                }
                c->req.hdr.blk = pci_map_single(h->pci_dev, &(io->c), 
                                sizeof(ida_ioctl_t), 
@@ -1296,18 +1290,12 @@ static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io)
        case DIAG_PASS_THRU:
        case COLLECT_BUFFER:
        case WRITE_FLASH_ROM:
-               p = kmalloc(io->sg[0].size, GFP_KERNEL);
-               if (!p) 
-               { 
-                        error = -ENOMEM; 
-                        cmd_free(h, c, 0);
-                        return(error);
+               p = memdup_user(io->sg[0].addr, io->sg[0].size);
+               if (IS_ERR(p)) {
+                       error = PTR_ERR(p);
+                       cmd_free(h, c, 0);
+                       return error;
                 }
-               if (copy_from_user(p, io->sg[0].addr, io->sg[0].size)) {
-                       kfree(p);
-                        cmd_free(h, c, 0);
-                       return -EFAULT;
-               }
                c->req.sg[0].size = io->sg[0].size;
                c->req.sg[0].addr = pci_map_single(h->pci_dev, p, 
                        c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL);