drivers/staging/cx25821/cx25821-video.c: introduce missing kfree
authorJulia Lawall <julia@diku.dk>
Fri, 1 Apr 2011 14:23:44 +0000 (16:23 +0200)
committerGreg Kroah-Hartman <gregkh@suse.de>
Wed, 20 Apr 2011 21:11:47 +0000 (14:11 -0700)
commite2ce5049776f135b61fb87e9f8fad661f1d3c7ea
tree191d644bdb48b576bf93eb64e74742dd2baa9920
parent48c59f4b915caf4007e6d5a1f34b10fe10210b72
drivers/staging/cx25821/cx25821-video.c: 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,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
     when != if (...) { <+...x...+> }
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 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/cx25821/cx25821-video.c