linux-kernel - Re: BUG memory leakage at ./security/selinux/hooks.c

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Date:	Mon, 10 Aug 2009 21:53:01 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	iceberg <strakh@...ras.ru>
cc:	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
	Eric Paris <eparis@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: BUG memory leakage at ./security/selinux/hooks.c

Thanks for the report.  (Cc'd to the SELinux list).


On Mon, 10 Aug 2009, iceberg wrote:

>         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);
> 
> 
> --
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-- 
James Morris
<jmorris@...ei.org>
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