Btrfs: Fix oopsen in extent_tree.c during enospc

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index ff3f7c2be605..b074ad1416dd 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -244,7 +244,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
         if (search_start) {
                 struct btrfs_block_group_cache *shint;
                 shint = btrfs_lookup_block_group(info, search_start);
-                if (shint->data == data) {
+                if (shint && shint->data == data) {
                         used = btrfs_block_group_used(&shint->item);
                         if (used + shint->pinned <
                             div_factor(shint->key.offset, factor)) {
@@ -1255,8 +1255,7 @@ struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
         struct buffer_head *buf;
 
         ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
-                                 1, empty_size, hint,
-                                 (unsigned long)-1, &ins, 0);
+                                 1, empty_size, hint, (u64)-1, &ins, 0);
         if (ret) {
                 BUG_ON(ret > 0);
                 return ERR_PTR(ret);