This is a note to let you know that I've just added the patch titled
ext4: fix data offset overflow in ext4_xattr_fiemap() on 32-bit archs
to the 3.4-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-data-offset-overflow-in-ext4_xattr_fiemap-on-32-bit-archs.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a60697f411eb365fb09e639e6f183fe33d1eb796 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@xxxxxxx>
Date: Fri, 31 May 2013 19:38:56 -0400
Subject: ext4: fix data offset overflow in ext4_xattr_fiemap() on 32-bit archs
From: Jan Kara <jack@xxxxxxx>
commit a60697f411eb365fb09e639e6f183fe33d1eb796 upstream.
On 32-bit architectures with 32-bit sector_t computation of data offset
in ext4_xattr_fiemap() can overflow resulting in reporting bogus data
location. Fix the problem by typing block number to proper type before
shifting.
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/extents.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4713,7 +4713,7 @@ static int ext4_xattr_fiemap(struct inod
error = ext4_get_inode_loc(inode, &iloc);
if (error)
return error;
- physical = iloc.bh->b_blocknr << blockbits;
+ physical = (__u64)iloc.bh->b_blocknr << blockbits;
offset = EXT4_GOOD_OLD_INODE_SIZE +
EXT4_I(inode)->i_extra_isize;
physical += offset;
@@ -4721,7 +4721,7 @@ static int ext4_xattr_fiemap(struct inod
flags |= FIEMAP_EXTENT_DATA_INLINE;
brelse(iloc.bh);
} else { /* external block */
- physical = EXT4_I(inode)->i_file_acl << blockbits;
+ physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits;
length = inode->i_sb->s_blocksize;
}
Patches currently in stable-queue which might be from jack@xxxxxxx are
queue-3.4/ext4-fix-data-offset-overflow-in-ext4_xattr_fiemap-on-32-bit-archs.patch
queue-3.4/ext4-fix-overflow-when-counting-used-blocks-on-32-bit-architectures.patch
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