/* Called at mount-time, super-block is locked */
static int ext4_check_descriptors(struct super_block *sb,
+ ext4_fsblk_t sb_block,
ext4_group_t *first_not_zeroed)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
grp = i;
block_bitmap = ext4_block_bitmap(sb, gdp);
+ if (block_bitmap == sb_block) {
+ ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
+ "Block bitmap for group %u overlaps "
+ "superblock", i);
+ }
if (block_bitmap < first_block || block_bitmap > last_block) {
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
"Block bitmap for group %u not in group "
return 0;
}
inode_bitmap = ext4_inode_bitmap(sb, gdp);
+ if (inode_bitmap == sb_block) {
+ ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
+ "Inode bitmap for group %u overlaps "
+ "superblock", i);
+ }
if (inode_bitmap < first_block || inode_bitmap > last_block) {
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
"Inode bitmap for group %u not in group "
return 0;
}
inode_table = ext4_inode_table(sb, gdp);
+ if (inode_table == sb_block) {
+ ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
+ "Inode table for group %u overlaps "
+ "superblock", i);
+ }
if (inode_table < first_block ||
inode_table + sbi->s_itb_per_group - 1 > last_block) {
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
ext4_set_bit(s++, buf);
count++;
}
- for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
- ext4_set_bit(EXT4_B2C(sbi, s++), buf);
- count++;
+ j = ext4_bg_num_gdb(sb, grp);
+ if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
+ ext4_error(sb, "Invalid number of block group "
+ "descriptor blocks: %d", j);
+ j = EXT4_BLOCKS_PER_GROUP(sb) - s;
}
+ count += j;
+ for (; j > 0; j--)
+ ext4_set_bit(EXT4_B2C(sbi, s++), buf);
}
if (!count)
return 0;
char *orig_data = kstrdup(data, GFP_KERNEL);
struct buffer_head *bh;
struct ext4_super_block *es = NULL;
- struct ext4_sb_info *sbi;
+ struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
ext4_fsblk_t block;
ext4_fsblk_t sb_block = get_sb_block(&data);
ext4_fsblk_t logical_sb_block;
unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ext4_group_t first_not_zeroed;
- sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
- if (!sbi)
- goto out_free_orig;
+ if ((data && !orig_data) || !sbi)
+ goto out_free_base;
sbi->s_blockgroup_lock =
kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
- if (!sbi->s_blockgroup_lock) {
- kfree(sbi);
- goto out_free_orig;
- }
+ if (!sbi->s_blockgroup_lock)
+ goto out_free_base;
+
sb->s_fs_info = sbi;
sbi->s_mount_opt = 0;
sbi->s_resuid = EXT4_DEF_RESUID;
*/
sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
- if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
- &journal_devnum, &journal_ioprio, NULL, 0)) {
- ext4_msg(sb, KERN_WARNING,
- "failed to parse options in superblock: %s",
- sbi->s_es->s_mount_opts);
+ if (sbi->s_es->s_mount_opts[0]) {
+ char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
+ sizeof(sbi->s_es->s_mount_opts),
+ GFP_KERNEL);
+ if (!s_mount_opts)
+ goto failed_mount;
+ if (!parse_options(s_mount_opts, sb, &journal_devnum,
+ &journal_ioprio, NULL, 0)) {
+ ext4_msg(sb, KERN_WARNING,
+ "failed to parse options in superblock: %s",
+ s_mount_opts);
+ }
+ kfree(s_mount_opts);
}
if (!parse_options((char *) data, sb, &journal_devnum,
&journal_ioprio, NULL, 0))
if (blocksize < EXT4_MIN_BLOCK_SIZE ||
blocksize > EXT4_MAX_BLOCK_SIZE) {
ext4_msg(sb, KERN_ERR,
- "Unsupported filesystem blocksize %d", blocksize);
+ "Unsupported filesystem blocksize %d (%d log_block_size)",
+ blocksize, le32_to_cpu(es->s_log_block_size));
+ goto failed_mount;
+ }
+ if (le32_to_cpu(es->s_log_block_size) >
+ (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
+ ext4_msg(sb, KERN_ERR,
+ "Invalid log block size: %u",
+ le32_to_cpu(es->s_log_block_size));
goto failed_mount;
}
sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
- if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
- goto cantfind_ext4;
sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
if (sbi->s_inodes_per_block == 0)
goto cantfind_ext4;
+ if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
+ sbi->s_inodes_per_group > blocksize * 8) {
+ ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
+ sbi->s_blocks_per_group);
+ goto failed_mount;
+ }
sbi->s_itb_per_group = sbi->s_inodes_per_group /
sbi->s_inodes_per_block;
sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
"block size (%d)", clustersize, blocksize);
goto failed_mount;
}
+ if (le32_to_cpu(es->s_log_cluster_size) >
+ (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
+ ext4_msg(sb, KERN_ERR,
+ "Invalid log cluster size: %u",
+ le32_to_cpu(es->s_log_cluster_size));
+ goto failed_mount;
+ }
sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
le32_to_cpu(es->s_log_block_size);
sbi->s_clusters_per_group =
}
sbi->s_cluster_ratio = clustersize / blocksize;
- if (sbi->s_inodes_per_group > blocksize * 8) {
- ext4_msg(sb, KERN_ERR,
- "#inodes per group too big: %lu",
- sbi->s_inodes_per_group);
- goto failed_mount;
- }
-
/*
* Test whether we have more sectors than will fit in sector_t,
* and whether the max offset is addressable by the page cache.
goto failed_mount2;
}
}
- if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
+ if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
goto failed_mount2;
}
descr = "out journal";
ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
- "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
+ "Opts: %.*s%s%s", descr,
+ (int) sizeof(sbi->s_es->s_mount_opts),
+ sbi->s_es->s_mount_opts,
*sbi->s_es->s_mount_opts ? "; " : "", orig_data);
if (es->s_error_count)
out_fail:
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
+out_free_base:
kfree(sbi);
-out_free_orig:
kfree(orig_data);
return ret;
}