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authorQu Wenruo <wqu@suse.com>2019-08-26 15:40:39 +0800
committerDavid Sterba <dsterba@suse.com>2019-11-18 12:46:46 +0100
commit71bf92a9b8777635fede96eb4ab3b5b7bf310159 (patch)
treed1051998489f2ec13ce4ebc39ab5cfbc78f1f516 /fs/btrfs/tree-checker.c
parentc18679ebd86857d4dae5a7462f38c4c98d8445de (diff)
btrfs: tree-checker: Add check for INODE_REF
For INODE_REF we will check: - Objectid (ino) against previous key To detect missing INODE_ITEM. - No overflow/padding in the data payload Much like DIR_ITEM, but with less members to check. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/tree-checker.c')
-rw-r--r--fs/btrfs/tree-checker.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 5aca82e67309..f041ec5f415c 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -1247,6 +1247,56 @@ static int check_extent_data_ref(struct extent_buffer *leaf,
return 0;
}
+#define inode_ref_err(fs_info, eb, slot, fmt, args...) \
+ inode_item_err(fs_info, eb, slot, fmt, ##args)
+static int check_inode_ref(struct extent_buffer *leaf,
+ struct btrfs_key *key, struct btrfs_key *prev_key,
+ int slot)
+{
+ struct btrfs_inode_ref *iref;
+ unsigned long ptr;
+ unsigned long end;
+
+ /* namelen can't be 0, so item_size == sizeof() is also invalid */
+ if (btrfs_item_size_nr(leaf, slot) <= sizeof(*iref)) {
+ inode_ref_err(fs_info, leaf, slot,
+ "invalid item size, have %u expect (%zu, %u)",
+ btrfs_item_size_nr(leaf, slot),
+ sizeof(*iref), BTRFS_LEAF_DATA_SIZE(leaf->fs_info));
+ return -EUCLEAN;
+ }
+
+ ptr = btrfs_item_ptr_offset(leaf, slot);
+ end = ptr + btrfs_item_size_nr(leaf, slot);
+ while (ptr < end) {
+ u16 namelen;
+
+ if (ptr + sizeof(iref) > end) {
+ inode_ref_err(fs_info, leaf, slot,
+ "inode ref overflow, ptr %lu end %lu inode_ref_size %zu",
+ ptr, end, sizeof(iref));
+ return -EUCLEAN;
+ }
+
+ iref = (struct btrfs_inode_ref *)ptr;
+ namelen = btrfs_inode_ref_name_len(leaf, iref);
+ if (ptr + sizeof(*iref) + namelen > end) {
+ inode_ref_err(fs_info, leaf, slot,
+ "inode ref overflow, ptr %lu end %lu namelen %u",
+ ptr, end, namelen);
+ return -EUCLEAN;
+ }
+
+ /*
+ * NOTE: In theory we should record all found index numbers
+ * to find any duplicated indexes, but that will be too time
+ * consuming for inodes with too many hard links.
+ */
+ ptr += sizeof(*iref) + namelen;
+ }
+ return 0;
+}
+
/*
* Common point to switch the item-specific validation.
*/
@@ -1269,6 +1319,9 @@ static int check_leaf_item(struct extent_buffer *leaf,
case BTRFS_XATTR_ITEM_KEY:
ret = check_dir_item(leaf, key, prev_key, slot);
break;
+ case BTRFS_INODE_REF_KEY:
+ ret = check_inode_ref(leaf, key, prev_key, slot);
+ break;
case BTRFS_BLOCK_GROUP_ITEM_KEY:
ret = check_block_group_item(leaf, key, slot);
break;