Strangely, we have level check in btrfs_print_tree() while we don't have the same check in read_node_slot().
That's to say, for the following corruption, btrfs_search_slot() or btrfs_next_leaf() can return invalid leaf: Parent eb: node XXXXXX level 1 ^^^^^^^ Child should be leaf (level 0) ... key (XXX XXX XXX) block YYYYYY Child eb: leaf YYYYYY level 1 ^^^^^^^ Something went wrong now And for the corrupted leaf returned, later caller can be screwed up easily. Although the root cause (powerloss, but still something wrong breaking metadata CoW of btrfs) is still unknown, at least enhance btrfs-progs to avoid SEGV. Reported-by: Ralph Gauges <ralphgau...@googlemail.com> Signed-off-by: Qu Wenruo <w...@suse.com> --- changlog: v2: Check if the extent buffer is up-to-date before checking its level to avoid possible NULL pointer access. --- ctree.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/ctree.c b/ctree.c index 4fc33b14000a..430805e3043f 100644 --- a/ctree.c +++ b/ctree.c @@ -22,6 +22,7 @@ #include "repair.h" #include "internal.h" #include "sizes.h" +#include "messages.h" static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level); @@ -640,7 +641,9 @@ static int bin_search(struct extent_buffer *eb, struct btrfs_key *key, struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info, struct extent_buffer *parent, int slot) { + struct extent_buffer *ret; int level = btrfs_header_level(parent); + if (slot < 0) return NULL; if (slot >= btrfs_header_nritems(parent)) @@ -649,8 +652,19 @@ struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info, if (level == 0) return NULL; - return read_tree_block(fs_info, btrfs_node_blockptr(parent, slot), + ret = read_tree_block(fs_info, btrfs_node_blockptr(parent, slot), btrfs_node_ptr_generation(parent, slot)); + if (!extent_buffer_uptodate(ret)) + return ERR_PTR(-EIO); + + if (btrfs_header_level(ret) != level - 1) { + error("child eb corrupted: parent bytenr=%llu item=%d parent level=%d child level=%d", + btrfs_header_bytenr(parent), slot, + btrfs_header_level(parent), btrfs_header_level(ret)); + free_extent_buffer(ret); + return ERR_PTR(-EIO); + } + return ret; } static int balance_level(struct btrfs_trans_handle *trans, -- 2.16.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html