Patch "ext4: keep existing extra fields when inode expands" has been added to the 4.9-stable tree

Patch "ext4: keep existing extra fields when inode expands" has been added to the 4.9-stable tree

[gregkh]

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

    ext4: keep existing extra fields when inode expands

to the 4.9-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:
     ext4-keep-existing-extra-fields-when-inode-expands.patch
and it can be found in the queue-4.9 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 887a9730614727c4fff7cb756711b190593fc1df Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Date: Sun, 21 May 2017 22:36:23 -0400
Subject: ext4: keep existing extra fields when inode expands

From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>

commit 887a9730614727c4fff7cb756711b190593fc1df upstream.

ext4_expand_extra_isize() should clear only space between old and new
size.

Fixes: 6dd4ee7cab7e # v2.6.23
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/ext4/inode.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5441,8 +5441,9 @@ static int ext4_expand_extra_isize(struc
 	/* No extended attributes present */
 	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
 	    header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) {
-		memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE, 0,
-			new_extra_isize);
+		memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE +
+		       EXT4_I(inode)->i_extra_isize, 0,
+		       new_extra_isize - EXT4_I(inode)->i_extra_isize);
 		EXT4_I(inode)->i_extra_isize = new_extra_isize;
 		return 0;
 	}


Patches currently in stable-queue which might be from khlebnikov@yandex-team.ru are

queue-4.9/ext4-keep-existing-extra-fields-when-inode-expands.patch