Btrfs-progs: fix segfault when using tools fs with tree log

We just free the log root after we set it up when we open a ctree in the tools.
This isn't nice, it makes double free's and leaks eb's, makes segfaults with
btrfs-image.  So fix this to be correct, and fix the cleanup if the buffer is
not uptodate.  With this fix I no longer segfault trying to do btrfs-image on a
file system with a log tree.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/disk-io.c b/disk-io.c
index a9fd3749..6ef35bbf 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -660,11 +660,12 @@ static int find_and_setup_log_root(struct btrfs_root *tree_root,
 	fs_info->log_root_tree = log_root;
 
 	if (!extent_buffer_uptodate(log_root->node)) {
+		free_extent_buffer(log_root->node);
 		free(log_root);
+		fs_info->log_root_tree = NULL;
 		return -EIO;
 	}
 
-	free(log_root);
 	return 0;
 }