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| author | Yan <yanzheng@21cn.com> | 2007-10-29 12:01:05 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:03:57 -0400 |
| commit | b56baf5bedccd3258643b09289f17ceab3ddea52 (patch) | |
| tree | eb493a33d091f32deed028c4e66de0e9342c7628 /fs/btrfs/file-item.c | |
| parent | 689f9346612d96ab93890160cf2fe0df5217ab73 (diff) | |
| download | lwn-b56baf5bedccd3258643b09289f17ceab3ddea52.tar.gz lwn-b56baf5bedccd3258643b09289f17ceab3ddea52.zip | |
Minor fix for btrfs_csum_file_block.
Execution should goto label 'insert' when 'btrfs_next_leaf' return a
non-zero value, otherwise the parameter 'slot' for
'btrfs_item_key_to_cpu' may be out of bounds. The original codes jump
to label 'insert' only when 'btrfs_next_leaf' return a negative
value.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/file-item.c')
| -rw-r--r-- | fs/btrfs/file-item.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index 482a2b615327..7eb9a5412e2f 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -178,13 +178,11 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans, nritems = btrfs_header_nritems(path->nodes[0]); if (path->slots[0] >= nritems - 1) { ret = btrfs_next_leaf(root, path); - if (ret == 1) { + if (ret == 1) found_next = 1; - } else if (ret == 0) { - slot = 0; - } else { + if (ret != 0) goto insert; - } + slot = 0; } btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot); if (found_key.objectid != objectid || @@ -238,7 +236,7 @@ insert: csum_offset = 0; if (found_next) { u64 tmp = min((u64)i_size_read(inode), next_offset); - tmp -= offset + root->sectorsize - 1; + tmp -= offset & ~((u64)root->sectorsize -1); tmp >>= root->fs_info->sb->s_blocksize_bits; tmp = max((u64)1, tmp); tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root)); |