diff options
Diffstat (limited to 'fs/ext2/balloc.c')
| -rw-r--r-- | fs/ext2/balloc.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c index e124f3d709b2..b8cfab8f98b9 100644 --- a/fs/ext2/balloc.c +++ b/fs/ext2/balloc.c @@ -77,26 +77,33 @@ static int ext2_valid_block_bitmap(struct super_block *sb, ext2_grpblk_t next_zero_bit; ext2_fsblk_t bitmap_blk; ext2_fsblk_t group_first_block; + ext2_grpblk_t max_bit; group_first_block = ext2_group_first_block_no(sb, block_group); + max_bit = ext2_group_last_block_no(sb, block_group) - group_first_block; /* check whether block bitmap block number is set */ bitmap_blk = le32_to_cpu(desc->bg_block_bitmap); offset = bitmap_blk - group_first_block; - if (!ext2_test_bit(offset, bh->b_data)) + if (offset < 0 || offset > max_bit || + !ext2_test_bit(offset, bh->b_data)) /* bad block bitmap */ goto err_out; /* check whether the inode bitmap block number is set */ bitmap_blk = le32_to_cpu(desc->bg_inode_bitmap); offset = bitmap_blk - group_first_block; - if (!ext2_test_bit(offset, bh->b_data)) + if (offset < 0 || offset > max_bit || + !ext2_test_bit(offset, bh->b_data)) /* bad block bitmap */ goto err_out; /* check whether the inode table block number is set */ bitmap_blk = le32_to_cpu(desc->bg_inode_table); offset = bitmap_blk - group_first_block; + if (offset < 0 || offset > max_bit || + offset + EXT2_SB(sb)->s_itb_per_group - 1 > max_bit) + goto err_out; next_zero_bit = ext2_find_next_zero_bit(bh->b_data, offset + EXT2_SB(sb)->s_itb_per_group, offset); @@ -412,7 +419,7 @@ void ext2_init_block_alloc_info(struct inode *inode) struct ext2_block_alloc_info *block_i; struct super_block *sb = inode->i_sb; - block_i = kmalloc(sizeof(*block_i), GFP_NOFS); + block_i = kmalloc(sizeof(*block_i), GFP_KERNEL); if (block_i) { struct ext2_reserve_window_node *rsv = &block_i->rsv_window_node; |