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path: root/fs/hfsplus/btree.c
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Diffstat (limited to 'fs/hfsplus/btree.c')
-rw-r--r--fs/hfsplus/btree.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c
index d4bd864ce108..82caff215e08 100644
--- a/fs/hfsplus/btree.c
+++ b/fs/hfsplus/btree.c
@@ -63,10 +63,23 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
tree->max_key_len = be16_to_cpu(head->max_key_len);
tree->depth = be16_to_cpu(head->depth);
- /* Set the correct compare function */
- if (id == HFSPLUS_EXT_CNID) {
+ /* Verify the tree and set the correct compare function */
+ switch (id) {
+ case HFSPLUS_EXT_CNID:
+ if (tree->max_key_len != HFSPLUS_EXT_KEYLEN - sizeof(u16)) {
+ printk(KERN_ERR "hfs: invalid extent max_key_len %d\n",
+ tree->max_key_len);
+ goto fail_page;
+ }
tree->keycmp = hfsplus_ext_cmp_key;
- } else if (id == HFSPLUS_CAT_CNID) {
+ break;
+ case HFSPLUS_CAT_CNID:
+ if (tree->max_key_len != HFSPLUS_CAT_KEYLEN - sizeof(u16)) {
+ printk(KERN_ERR "hfs: invalid catalog max_key_len %d\n",
+ tree->max_key_len);
+ goto fail_page;
+ }
+
if (test_bit(HFSPLUS_SB_HFSX, &HFSPLUS_SB(sb)->flags) &&
(head->key_type == HFSPLUS_KEY_BINARY))
tree->keycmp = hfsplus_cat_bin_cmp_key;
@@ -74,7 +87,8 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
tree->keycmp = hfsplus_cat_case_cmp_key;
set_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
}
- } else {
+ break;
+ default:
printk(KERN_ERR "hfs: unknown B*Tree requested\n");
goto fail_page;
}
@@ -84,6 +98,7 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
goto fail_page;
if (!tree->node_count)
goto fail_page;
+
tree->node_size_shift = ffs(size) - 1;
tree->pages_per_bnode = (tree->node_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
@@ -93,9 +108,9 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
return tree;
fail_page:
- tree->inode->i_mapping->a_ops = &hfsplus_aops;
page_cache_release(page);
free_inode:
+ tree->inode->i_mapping->a_ops = &hfsplus_aops;
iput(tree->inode);
free_tree:
kfree(tree);