tag: don't allow tags to non-existent objects

These indicate an inconsistency in the repository which we've created,
so don't allow them.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/tag.c b/src/tag.c
index 994389c9d..bd9ddda83 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -209,6 +209,9 @@ static int tag_create(
 		return error;
 	}
 
+	if (!git_odb_exists(repo->db, target))
+		return GIT_ENOTFOUND;
+
 	/* Try to find out what the type is */
 	if (target_type == GIT_OBJ_ANY) {
 		size_t _unused;