fs/ecryptfs/file.c: introduce missing free
authorJulia Lawall <julia@diku.dk>
Fri, 6 Aug 2010 20:58:49 +0000 (22:58 +0200)
committerTyler Hicks <tyhicks@linux.vnet.ibm.com>
Mon, 9 Aug 2010 18:25:24 +0000 (13:25 -0500)
commitceeab92971e8af05c1e81a4ff2c271124b55bb9b
tree517cc3160679d39da57cee982a1aff7cbf7fb789
parent31f73bee3e170b7cabb35db9e2f4bf7919b9d036
fs/ecryptfs/file.c: introduce missing free

The comments in the code indicate that file_info should be released if the
function fails.  This releasing is done at the label out_free, not out.

The semantic match that finds this 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 = kmem_cache_zalloc(...);
...
if (x == NULL) S
<... when != x
     when != if (...) { <+...x...+> }
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 return <+...x...+>;
|
 return@p2 ...;
)

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

print "* file: %s kmem_cache_zalloc %s" % (p1[0].file,p1[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: stable@kernel.org
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
fs/ecryptfs/file.c