coccinelle: api: extend memdup_user rule with vmemdup_user()

-    ...+>

-  }

@depends on patch@

expression from,to,size;

identifier l1,l2;

@@

-  to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));

+  to = vmemdup_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

-    ...+>

-  }

@r depends on !patch@

expression from,to,size;

position p;

   if (copy_from_user(to, from, size) != 0)

   S2

@rv depends on !patch@

expression from,to,size;

position p;

statement S1,S2;

@@

*  to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));

   if (to==NULL || ...) S1

   if (copy_from_user(to, from, size) != 0)

   S2

@script:python depends on org@

p << r.p;

@@

@@

coccilib.report.print_report(p[0], "WARNING opportunity for memdup_user")

@script:python depends on org@

p << rv.p;

@@

coccilib.org.print_todo(p[0], "WARNING opportunity for vmemdup_user")

@script:python depends on report@

p << rv.p;

@@

coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")