Btrfs: check return value of read_tree_block()

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / btrfs / extent-tree.c

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a6a8159c5d1ea08565c62d1ddeea4854180f9081..5bc658a9d85cb45cca0cbd8c8b68b2dddb8fce04 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6067,6 +6067,8 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
                if (reada && level == 1)
                        reada_walk_down(trans, root, wc, path);
                next = read_tree_block(root, bytenr, blocksize, generation);
+               if (!next)
+                       return -EIO;
                btrfs_tree_lock(next);
                btrfs_set_lock_blocking(next);
        }
@@ -7937,6 +7939,10 @@ static noinline int relocate_one_extent(struct btrfs_root *extent_root,
 
                        eb = read_tree_block(found_root, block_start,
                                             block_size, 0);
+                       if (!eb) {
+                               ret = -EIO;
+                               goto out;
+                       }
                        btrfs_tree_lock(eb);
                        BUG_ON(level != btrfs_header_level(eb));