From 1585d8d89ae1791d8f957731f5655700fbcc5664 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sun, 22 Nov 2009 20:48:34 -0500 Subject: [PATCH] ext4: add check for wraparound in ext4_data_block_valid() Signed-off-by: "Theodore Ts'o" --- fs/ext4/block_validity.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c index dc79b75d8f7..4df8621ec31 100644 --- a/fs/ext4/block_validity.c +++ b/fs/ext4/block_validity.c @@ -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) {