[PATCH 3/4] builtin-fast-export.c: fix crash on tagged trees

[Erik Faye-Lund <kusmabite@gmail.com>]

If a tag object points to a tree (or another unhandled type), the commit-
pointer is left uninitialized and later dereferenced. This patch adds a default
case to the switch that issues a warning and skips the object.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
---
 builtin-fast-export.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index 02bad1f..c3ce320 100644
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -375,6 +375,10 @@ static void get_tags_and_duplicates(struct object_array *pending,
 			case OBJ_BLOB:
 				handle_object(tag->object.sha1);
 				continue;
+			default: /* OBJ_TAG (nested tags) is already handled */
+				warning("Tag points to object of unexpected type %s, skipping.",
+				        typename(tag->object.type));
+				continue;
 			}
 			break;
 		default:
-- 
1.6.2.1.226.gcb2dd