mfd: Fix davinci memory leak
authorJulia Lawall <julia@diku.dk>
Tue, 1 Jun 2010 14:34:38 +0000 (16:34 +0200)
committerSamuel Ortiz <sameo@linux.intel.com>
Thu, 12 Aug 2010 09:27:20 +0000 (11:27 +0200)
commite2bde787131a01d0f2ca9baccaf3d107bf6c0c92
tree426c3fc1386079e1f19379294ddf7b2f3ed236da
parent8af5fe3bc59d73479ff701340e1a9bc7c6b5f0ff
mfd: Fix davinci memory leak

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: Samuel Ortiz <sameo@linux.intel.com>
drivers/mfd/davinci_voicecodec.c