btrfs: Avoid NULL pointer dereference of free_extent_buffer when read_tree_block...

[linux-2.6-block.git] / fs / btrfs / disk-io.c

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e5aad7f535aabc6344e5788de90b399a9c6bd492..84cbbb2d562ea1c8f281cc0e103b547f5530a73a 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2842,6 +2842,7 @@ int open_ctree(struct super_block *sb,
            !extent_buffer_uptodate(chunk_root->node)) {
                printk(KERN_ERR "BTRFS: failed to read chunk root on %s\n",
                       sb->s_id);
+               chunk_root->node = NULL;
                goto fail_tree_roots;
        }
        btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
@@ -2879,7 +2880,7 @@ retry_root_backup:
            !extent_buffer_uptodate(tree_root->node)) {
                printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n",
                       sb->s_id);
-
+               tree_root->node = NULL;
                goto recovery_tree_root;
        }