[4.2.y-ckt stable] Patch "ext4: fix an endianness bug in ext4_encrypted_zeroout()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    ext4: fix an endianness bug in ext4_encrypted_zeroout()

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt2.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From db0431b548cd683bf7863aed1c5bcd7c6f6572c1 Mon Sep 17 00:00:00 2001
From: Al Viro <viro at ZenIV.linux.org.uk>
Date: Thu, 26 Nov 2015 15:20:19 -0500
Subject: ext4: fix an endianness bug in ext4_encrypted_zeroout()

commit e2c9e0b28e146c9a3bce21408f3c02e24ac7ac31 upstream.

ex->ee_block is not host-endian (note that accesses of other fields
of *ex right next to that line go through the helpers that do proper
conversion from little-endian to host-endian; it might make sense
to add similar for ->ee_block to avoid reintroducing that kind of
bugs...)

Signed-off-by: Al Viro <viro at zeniv.linux.org.uk>
Signed-off-by: Theodore Ts'o <tytso at mit.edu>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 fs/ext4/crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index 54a5169..b44c4e5 100644
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -407,7 +407,7 @@ int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
 	struct ext4_crypto_ctx	*ctx;
 	struct page		*ciphertext_page = NULL;
 	struct bio		*bio;
-	ext4_lblk_t		lblk = ex->ee_block;
+	ext4_lblk_t		lblk = le32_to_cpu(ex->ee_block);
 	ext4_fsblk_t		pblk = ext4_ext_pblock(ex);
 	unsigned int		len = ext4_ext_get_actual_len(ex);
 	int			err = 0;
--
1.9.1