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drivers/scsi: use memdup_user

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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>
Cc: Doug Gilbert <dgilbert@interlog.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Julia Lawall 2010-08-10 18:01:27 -07:00 committed by Linus Torvalds
parent a737b88df8
commit 3094141c65
1 changed files with 3 additions and 8 deletions
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11
drivers/scsi/sg.c
View File

@ -1686,14 +1686,9 @@ static int sg_start_req(Sg_request *srp, unsigned char *cmd)
int len, size = sizeof(struct sg_iovec) * iov_count;
struct iovec *iov;
iov = kmalloc(size, GFP_ATOMIC);
if (!iov)
return -ENOMEM;
if (copy_from_user(iov, hp->dxferp, size)) {
kfree(iov);
return -EFAULT;
}
iov = memdup_user(hp->dxferp, size);
if (IS_ERR(iov))
return PTR_ERR(iov);
len = iov_length(iov, iov_count);
if (hp->dxfer_len < len) {