BUG memory leakage at ./security/selinux/hooks.c

[iceberg <strakh@ispras.ru>]

????????KERNEL_VERSION: 2.6.30.4??
????????SUBJECT: ?in function inode_doinit_with_dentry memory is not released 
on error  path (if rc<0).
????????DESCRIBE:
????????In ./security/selinux/hooks.c in function inode_doinit_with_dentry:??
1. If in the line 1278 we successfully allocate memory and assign it to 
context variablehen 
2. if in the line 1284 getxattr returns -ERANGE and 
3. if in the line 1288 getxattr returns rc<0 
then we go to out_unlock without releasing memory pointed to by context 
variable.

1278 ????????????????context?=?kmalloc(len,?GFP_NOFS);
1279 ????????????????if?(!context)?{
1280 ????????????????????????rc?=?-ENOMEM;
1281 ????????????????????????dput(dentry);
1282 ????????????????????????goto?out_unlock;
1283 ????????????????}
1284 ????????????????rc?=?inode->i_op->getxattr(dentry,?XATTR_NAME_SELINUX,
1285 ???????????????????????????????????????????context,?len);
1286 ????????????????if?(rc?==?-ERANGE)?{
1287 ????????????????????????/*?Need?a?larger?buffer.??Query?for?the
right?size.?*/
1288 ????????????????????????rc?=?inode->i_op->getxattr(dentry,
XATTR_NAME_SELINUX,
1289 ???????????????????????????????????????????????????NULL,?0);
1290 ????????????????????????if?(rc?<?0)?{
1291 ????????????????????????????????dput(dentry);
1292 ????????????????????????????????goto?out_unlock;
1293 ????????????????????????}
1294 ????????????????????????kfree(context);
1295 ????????????????????????len?=?rc;
1296 ????????????????????????context?=?kmalloc(len,?GFP_NOFS);