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Commit 1585d8d8 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: add check for wraparound in ext4_data_block_valid() 



Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 6eebee62

fs/ext4/block_validity.c

+1 −0
Original line number Diff line number Diff line
@@ -228,6 +228,7 @@ int ext4_data_block_valid(struct ext4_sb_info *sbi, ext4_fsblk_t start_blk, 
	struct rb_node *n = sbi->system_blks.rb_node;



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

	    (start_blk + count < start_blk) ||

	    (start_blk + count > ext4_blocks_count(sbi->s_es)))

		return 0;

	while (n) {