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Commit e5d39597 authored by Chengguang Xu's avatar Chengguang Xu Committed by Jan Kara
Browse files

ext2: fix block range in ext2_data_block_valid() 



For block validity we should check the block range
from start_block to start_block + count - 1, so fix
the range in ext2_data_block_valid() and also modify
the count argument properly in calling place.

Signed-off-by: default avatarChengguang Xu <cgxu519@zoho.com.cn>
Link: https://lore.kernel.org/r/20190723112155.20329-1-cgxu519@zoho.com.cn


Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 6fbacb85

fs/ext2/balloc.c

+3 −3
Original line number Diff line number Diff line
@@ -1203,13 +1203,13 @@ int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 
			  unsigned int count)

{

	if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||

	    (start_blk + count < start_blk) ||

	    (start_blk > le32_to_cpu(sbi->s_es->s_blocks_count)))

	    (start_blk + count - 1 < start_blk) ||

	    (start_blk + count - 1 >= le32_to_cpu(sbi->s_es->s_blocks_count)))

		return 0;



	/* Ensure we do not step over superblock */

	if ((start_blk <= sbi->s_sb_block) &&

	    (start_blk + count >= sbi->s_sb_block))

	    (start_blk + count - 1 >= sbi->s_sb_block))

		return 0;



	return 1;

fs/ext2/xattr.c

+1 −1
Original line number Diff line number Diff line
@@ -794,7 +794,7 @@ ext2_xattr_delete_inode(struct inode *inode) 
	if (!EXT2_I(inode)->i_file_acl)

		goto cleanup;



	if (!ext2_data_block_valid(sbi, EXT2_I(inode)->i_file_acl, 0)) {

	if (!ext2_data_block_valid(sbi, EXT2_I(inode)->i_file_acl, 1)) {

		ext2_error(inode->i_sb, "ext2_xattr_delete_inode",

			"inode %ld: xattr block %d is out of data blocks range",

			inode->i_ino, EXT2_I(inode)->i_file_acl);