This is a note to let you know that I've just added the patch titled
ext4: fix inode checksum calculation problem if i_extra_size is small
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-fix-inode-checksum-calculation-problem-if-i_extra_size-is-small.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@xxxxxxxxxxxxxxx> know about it.
>From 05ac5aa18abd7db341e54df4ae2b4c98ea0e43b7 Mon Sep 17 00:00:00 2001
From: Daeho Jeong <daeho.jeong@xxxxxxxxxxx>
Date: Thu, 1 Dec 2016 11:49:12 -0500
Subject: ext4: fix inode checksum calculation problem if i_extra_size is small
From: Daeho Jeong <daeho.jeong@xxxxxxxxxxx>
commit 05ac5aa18abd7db341e54df4ae2b4c98ea0e43b7 upstream.
We've fixed the race condition problem in calculating ext4 checksum
value in commit b47820edd163 ("ext4: avoid modifying checksum fields
directly during checksum veficationon"). However, by this change,
when calculating the checksum value of inode whose i_extra_size is
less than 4, we couldn't calculate the checksum value in a proper way.
This problem was found and reported by Nix, Thank you.
Reported-by: Nix <nix@xxxxxxxxxxxxx>
Signed-off-by: Daeho Jeong <daeho.jeong@xxxxxxxxxxx>
Signed-off-by: Youngjin Gil <youngjin.gil@xxxxxxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/inode.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -71,10 +71,9 @@ static __u32 ext4_inode_csum(struct inod
csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum,
csum_size);
offset += csum_size;
- csum = ext4_chksum(sbi, csum, (__u8 *)raw + offset,
- EXT4_INODE_SIZE(inode->i_sb) -
- offset);
}
+ csum = ext4_chksum(sbi, csum, (__u8 *)raw + offset,
+ EXT4_INODE_SIZE(inode->i_sb) - offset);
}
return csum;
Patches currently in stable-queue which might be from daeho.jeong@xxxxxxxxxxx are
queue-4.9/ext4-fix-inode-checksum-calculation-problem-if-i_extra_size-is-small.patch