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drivers/isdn: 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: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julia Lawall 2010-05-21 22:26:42 +00:00 committed by David S. Miller
parent 7d88950426
commit 024cb8a67f
3 changed files with 12 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/isdn/i4l/isdn_ppp.c
View File

@ -449,14 +449,9 @@ static int get_filter(void __user *arg, struct sock_filter **p)
/* uprog.len is unsigned short, so no overflow here */
len = uprog.len * sizeof(struct sock_filter);
code = kmalloc(len, GFP_KERNEL);
if (code == NULL)
return -ENOMEM;
if (copy_from_user(code, uprog.filter, len)) {
kfree(code);
return -EFAULT;
}
code = memdup_user(uprog.filter, len);
if (IS_ERR(code))
return PTR_ERR(code);
err = sk_chk_filter(code, uprog.len);
if (err) {

10
drivers/isdn/pcbit/drv.c
View File

@ -411,14 +411,10 @@ static int pcbit_writecmd(const u_char __user *buf, int len, int driver, int cha
return -EINVAL;
}
cbuf = kmalloc(len, GFP_KERNEL);
if (!cbuf)
return -ENOMEM;
cbuf = memdup_user(buf, len);
if (IS_ERR(cbuf))
return PTR_ERR(cbuf);
if (copy_from_user(cbuf, buf, len)) {
kfree(cbuf);
return -EFAULT;
}
memcpy_toio(dev->sh_mem, cbuf, len);
kfree(cbuf);
return len;

23
drivers/isdn/sc/ioctl.c
View File

@ -215,19 +215,13 @@ int sc_ioctl(int card, scs_ioctl *data)
pr_debug("%s: DCBIOSETSPID: ioctl received\n",
sc_adapter[card]->devicename);
spid = kmalloc(SCIOC_SPIDSIZE, GFP_KERNEL);
if(!spid) {
kfree(rcvmsg);
return -ENOMEM;
}
/*
* Get the spid from user space
*/
if (copy_from_user(spid, data->dataptr, SCIOC_SPIDSIZE)) {
spid = memdup_user(data->dataptr, SCIOC_SPIDSIZE);
if (IS_ERR(spid)) {
kfree(rcvmsg);
kfree(spid);
return -EFAULT;
return PTR_ERR(spid);
}
pr_debug("%s: SCIOCSETSPID: setting channel %d spid to %s\n",
@ -296,18 +290,13 @@ int sc_ioctl(int card, scs_ioctl *data)
pr_debug("%s: SCIOSETDN: ioctl received\n",
sc_adapter[card]->devicename);
dn = kmalloc(SCIOC_DNSIZE, GFP_KERNEL);
if (!dn) {
kfree(rcvmsg);
return -ENOMEM;
}
/*
* Get the spid from user space
*/
if (copy_from_user(dn, data->dataptr, SCIOC_DNSIZE)) {
dn = memdup_user(data->dataptr, SCIOC_DNSIZE);
if (IS_ERR(dn)) {
kfree(rcvmsg);
kfree(dn);
return -EFAULT;
return PTR_ERR(dn);
}
pr_debug("%s: SCIOCSETDN: setting channel %d dn to %s\n",