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| author | Jan Kara <jack@suse.cz> | 2013-05-31 19:38:56 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-21 18:21:32 -0700 |
| commit | b9ea84239c8098c367680278d1daa4d69ae88719 (patch) | |
| tree | ec95ecfefbc65806db12ee765690d3ea67a57fa2 | |
| parent | 80747f06d94394d0c2bc384515abe0ba460e58f4 (diff) | |
| download | lwn-b9ea84239c8098c367680278d1daa4d69ae88719.tar.gz lwn-b9ea84239c8098c367680278d1daa4d69ae88719.zip | |
ext4: fix data offset overflow in ext4_xattr_fiemap() on 32-bit archs
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@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/ext4/extents.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index bc0f1910b9cf..e49da585739f 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4659,7 +4659,7 @@ static int ext4_xattr_fiemap(struct inode *inode, 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; @@ -4667,7 +4667,7 @@ static int ext4_xattr_fiemap(struct inode *inode, 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; } |