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ext4: add check for wraparound in ext4_data_block_valid()

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Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-11-22 20:48:34 -05:00
parent 6eebee6255
commit 1585d8d89a
1 changed files with 1 additions and 0 deletions
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fs/ext4/block_validity.c
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@ -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; struct rb_node *n = sbi->system_blks.rb_node;
if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) || 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))) (start_blk + count > ext4_blocks_count(sbi->s_es)))
return 0; return 0;
while (n) { while (n) {