* Read group descriptors
*/
blocks_per_group = EXT2_BLOCKS_PER_GROUP(fs->super);
- if (blocks_per_group == 0 ||
+ if (blocks_per_group < 8 ||
blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(fs->super) ||
fs->inode_blocks_per_group > EXT2_MAX_INODES_PER_GROUP(fs->super) ||
EXT2_DESC_PER_BLOCK(fs->super) == 0 ||