thodg/libgit2

diff --git a/src/revparse.c b/src/revparse.c
index c275b55..3f210d1 100644
--- a/src/revparse.c
+++ b/src/revparse.c
@@ -323,10 +323,10 @@ static git_object* dereference_object(git_object *obj)
       break;
    case GIT_OBJ_TAG:
       {
-            git_object *newobj = NULL;
-            if (0 == git_tag_target(&newobj, (git_tag*)obj)) {
-               return newobj;
-            }
+         git_object *newobj = NULL;
+         if (0 == git_tag_target(&newobj, (git_tag*)obj)) {
+            return newobj;
+         }
       }
       break;
 
@@ -506,8 +506,8 @@ static int handle_linear_syntax(git_object **out, git_object *obj, const char *m
    /* "~" is the same as "~1" */
    if (*movement == '\0') {
       n = 1;
-   } else {
-      git__strtol32(&n, movement, NULL, 0);
+   } else if (git__strtol32(&n, movement, NULL, 0) < 0) {
+      return GIT_ERROR;
    }
    commit1 = (git_commit*)obj;
 
@@ -581,7 +581,7 @@ static int handle_colon_syntax(git_object **out,
    git_tree_free(tree);
 
    if (error < 0)
-	   return error;
+      return error;
 
    return git_object_lookup(out, repo, &oid, GIT_OBJ_ANY);
 }
@@ -623,7 +623,7 @@ static int revparse_global_grep(git_object **out, git_repository *repo, const ch
          }
          if (!resultobj) {
             giterr_set(GITERR_REFERENCE, "Couldn't find a match for %s", pattern);
-	    git_object_free(walkobj);
+            git_object_free(walkobj);
          } else {
             *out = resultobj;
          }
diff --git a/tests-clar/refs/revparse.c b/tests-clar/refs/revparse.c
index c303e1b..2ee72f2 100644
--- a/tests-clar/refs/revparse.c
+++ b/tests-clar/refs/revparse.c
@@ -104,6 +104,9 @@ void test_refs_revparse__to_type(void)
 
 void test_refs_revparse__linear_history(void)
 {
+   cl_git_fail(git_revparse_single(&g_obj, g_repo, "foo~bar"));
+   cl_git_fail(git_revparse_single(&g_obj, g_repo, "master~bar"));
+
    test_object("master~0", "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
    test_object("master~1", "be3563ae3f795b2b4353bcce3a527ad0a4f7f644");
    test_object("master~2", "9fd738e8f7967c078dceed8190330fc8648ee56a");