Patch "ubifs: free the encrypted symlink target" has been added to the 4.14-stable tree

Patch "ubifs: free the encrypted symlink target" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ubifs: free the encrypted symlink target

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ubifs-free-the-encrypted-symlink-target.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6b46d444146eb8d0b99562795cea8086639d7282 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@google.com>
Date: Thu, 11 Jan 2018 23:27:00 -0500
Subject: ubifs: free the encrypted symlink target

From: Eric Biggers <ebiggers@google.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@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;
 }
 


Patches currently in stable-queue which might be from ebiggers@google.com are

queue-4.14/ubifs-free-the-encrypted-symlink-target.patch
queue-4.14/nfs-reject-request-for-id_legacy-key-without-auxdata.patch