Error handling code following a kmalloc should free the allocated data.

The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
expression E;
identifier f,f1;
position p1,p2;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
<... when != x
     when != if (...) { <+...x...+> }
     when != (x) == NULL
     when != (x) != NULL
     when != (x) == 0
     when != (x) != 0
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 return <+...x...+>;
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: jack wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>