[PATCH] SELinux: re. BUG memory leakage at./security/selinux/hooks.c

[James Morris]

Please review.

Author: James Morris <jmorris@xxxxxxxxx>
Date:   Mon Aug 10 22:00:13 2009 +1000

    SELinux: fix memory leakage in /security/selinux/hooks.c
    
    Fix memory leakage in /security/selinux/hooks.c
    
    The buffer always needs to be freed here; we either error
    out or allocate more memory.
    
    Reported-by: iceberg <strakh@xxxxxxxxx>
    Signed-off-by: James Morris <jmorris@xxxxxxxxx>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 15c2a08..1e8cfc4 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1285,6 +1285,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 		rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
 					   context, len);
 		if (rc == -ERANGE) {
+			kfree(context);
+
 			/* Need a larger buffer.  Query for the right size. */
 			rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
 						   NULL, 0);
@@ -1292,7 +1294,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 				dput(dentry);
 				goto out_unlock;
 			}
-			kfree(context);
 			len = rc;
 			context = kmalloc(len+1, GFP_NOFS);
 			if (!context) {

-- 
James Morris
<jmorris@xxxxxxxxx>
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