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ext4: fix data offset overflow in ext4_xattr_fiemap() on 32-bit archs 

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>
This commit is contained in:
Jan Kara 2013-05-31 19:38:56 -04:00 committed by Theodore Ts'o
parent e7293fd146
commit a60697f411
1 changed files with 2 additions and 2 deletions
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4
fs/ext4/extents.c
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@ -4679,7 +4679,7 @@ 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;
@ -4687,7 +4687,7 @@ 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;
}