Staging: comedi: introduce missing kfree
authorJulia Lawall <julia@diku.dk>
Thu, 25 Dec 2008 20:10:30 +0000 (21:10 +0100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 3 Apr 2009 21:53:40 +0000 (14:53 -0700)
commitb171041be02f171cd06712746b97a996f883ec10
tree2417a7462d24d28e69b56d03a90cc01b6add772c
parentfc0cb7d166f3c8a318d8b0c9580cfe12fed9234c
Staging: comedi: introduce missing kfree

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;
statement S;
expression E;
identifier f,l;
position p1,p2;
expression *ptr != NULL;
@@

(
if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S
|
x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
)
<... when != x
     when != if (...) { <+...x...+> }
x->f = E
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/staging/comedi/drivers/usbdux.c
drivers/staging/comedi/drivers/usbduxfast.c