linux-kernel - [PATCH 4.15 095/202] ubifs: free the encrypted symlink target

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Message-Id: <20180215151718.347947986@linuxfoundation.org>
Date:   Thu, 15 Feb 2018 16:16:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>,
        Theodore Tso <tytso@....edu>
Subject: [PATCH 4.15 095/202] ubifs: free the encrypted symlink target

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Biggers <ebiggers@...gle.com>

commit 6b46d444146eb8d0b99562795cea8086639d7282 upstream.

ubifs_symlink() forgot to free the kmalloc()'ed buffer holding the
encrypted symlink target, creating a memory leak.  Fix it.

(UBIFS could actually encrypt directly into ui->data, removing the
temporary buffer, but that is left for the patch that switches to use
the symlink helper functions.)

Fixes: ca7f85be8d6c ("ubifs: Add support for encrypted symlinks")
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ubifs/dir.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1216,10 +1216,8 @@ static int ubifs_symlink(struct inode *d
 		ostr.len = disk_link.len;
 
 		err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
-		if (err) {
-			kfree(sd);
+		if (err)
 			goto out_inode;
-		}
 
 		sd->len = cpu_to_le16(ostr.len);
 		disk_link.name = (char *)sd;
@@ -1251,11 +1249,10 @@ static int ubifs_symlink(struct inode *d
 		goto out_cancel;
 	mutex_unlock(&dir_ui->ui_mutex);
 
-	ubifs_release_budget(c, &req);
 	insert_inode_hash(inode);
 	d_instantiate(dentry, inode);
-	fscrypt_free_filename(&nm);
-	return 0;
+	err = 0;
+	goto out_fname;
 
 out_cancel:
 	dir->i_size -= sz_change;
@@ -1268,6 +1265,7 @@ out_fname:
 	fscrypt_free_filename(&nm);
 out_budg:
 	ubifs_release_budget(c, &req);
+	kfree(sd);
 	return err;
 }