From: Daeho Jeong <[email protected]>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
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 <[email protected]>
Signed-off-by: Daeho Jeong <[email protected]>
Signed-off-by: Youngjin Gil <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
---
fs/ext4/inode.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 50fc2d1da9a9..9a3e7cffd6eb 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -73,10 +73,9 @@ static __u32 ext4_inode_csum(struct inode *inode, struct
ext4_inode *raw,
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;
--
2.12.2
