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fs/ceph: introduce missing kfree 

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

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 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
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: Sage Weil <sage@newdream.net>
This commit is contained in:
Julia Lawall 2009-11-21 12:53:08 +01:00 committed by Sage Weil
parent b19a29af74
commit 60d877334f
1 changed files with 4 additions and 2 deletions
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6
fs/ceph/xattr.c
View File

@ -655,8 +655,10 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
/* do request */
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
req->r_inode = igrab(inode);
req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
req->r_num_caps = 1;