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| author | Chengguang Xu <cgxu519@zoho.com.cn> | 2019-07-23 19:21:54 +0800 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2019-07-31 12:04:42 +0200 |
| commit | e5d395974e043cdcedcd84a0d41aaebb723786d8 (patch) | |
| tree | 8ff04266c012c2ac4a3449149a9da23e3d489952 /fs/ext2/balloc.c | |
| parent | 6fbacb8539a6659d446a9efabb538cfc007c1427 (diff) | |
| download | linux-e5d395974e043cdcedcd84a0d41aaebb723786d8.tar.bz2 | |
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: Chengguang Xu <cgxu519@zoho.com.cn>
Link: https://lore.kernel.org/r/20190723112155.20329-1-cgxu519@zoho.com.cn
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext2/balloc.c')
| -rw-r--r-- | fs/ext2/balloc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c index 547c165299c0..92e9a7489174 100644 --- a/fs/ext2/balloc.c +++ b/fs/ext2/balloc.c @@ -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; |