On Mon 2019-05-20 14:14:13, Greg Kroah-Hartman wrote: > From: Theodore Ts'o <ty...@mit.edu> > > commit 345c0dbf3a30872d9b204db96b5857cd00808cae upstream. > > Add the blocks which belong to the journal inode to block_validity's > system zone so attempts to deallocate or overwrite the journal due a > corrupted file system where the journal blocks are also claimed by > another inode. > > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202879 > Signed-off-by: Theodore Ts'o <ty...@mit.edu> > Cc: sta...@kernel.org > Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
> +static int ext4_protect_reserved_inode(struct super_block *sb, u32 ino)
> +{
> + struct inode *inode;
> + struct ext4_sb_info *sbi = EXT4_SB(sb);
> + struct ext4_map_blocks map;
> + u32 i = 0, err = 0, num, n;
> +
> + if ((ino < EXT4_ROOT_INO) ||
> + (ino > le32_to_cpu(sbi->s_es->s_inodes_count)))
> + return -EINVAL;
> + inode = ext4_iget(sb, ino, EXT4_IGET_SPECIAL);
> + if (IS_ERR(inode))
> + return PTR_ERR(inode);
> + num = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
> + while (i < num) {
> + map.m_lblk = i;
> + map.m_len = num - i;
> + n = ext4_map_blocks(NULL, inode, &map, 0);
> + if (n < 0) {
> + err = n;
> + break;
> + }
n is unsigned, so this can not happen. Commit 102/ actually fixes this
up. Should they be merged together?
Pavel
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