1 files changed, 41 insertions, 14 deletions

diff --git a/commit-reach.c b/commit-reach.c
index 622eeb313d..a9da65c462 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -426,7 +426,7 @@ struct contains_stack {
 static int in_commit_list(const struct commit_list *want, struct commit *c)
 {
 	for (; want; want = want->next)
-		if (!oidcmp(&want->item->object.oid, &c->object.oid))
+		if (oideq(&want->item->object.oid, &c->object.oid))
 			return 1;
 	return 0;
 }
@@ -529,8 +529,8 @@ int commit_contains(struct ref_filter *filter, struct commit *commit,
 
 static int compare_commits_by_gen(const void *_a, const void *_b)
 {
-	const struct commit *a = (const struct commit *)_a;
-	const struct commit *b = (const struct commit *)_b;
+	const struct commit *a = *(const struct commit * const *)_a;
+	const struct commit *b = *(const struct commit * const *)_b;
 
 	if (a->generation < b->generation)
 		return -1;
@@ -547,20 +547,43 @@ int can_all_from_reach_with_flag(struct object_array *from,
 {
 	struct commit **list = NULL;
 	int i;
+	int nr_commits;
 	int result = 1;
 
 	ALLOC_ARRAY(list, from->nr);
+	nr_commits = 0;
 	for (i = 0; i < from->nr; i++) {
-		list[i] = (struct commit *)from->objects[i].item;
+		struct object *from_one = from->objects[i].item;
 
-		if (parse_commit(list[i]) ||
-		    list[i]->generation < min_generation)
-			return 0;
+		if (!from_one || from_one->flags & assign_flag)
+			continue;
+
+		from_one = deref_tag(the_repository, from_one,
+				     "a from object", 0);
+		if (!from_one || from_one->type != OBJ_COMMIT) {
+			/*
+			 * no way to tell if this is reachable by
+			 * looking at the ancestry chain alone, so
+			 * leave a note to ourselves not to worry about
+			 * this object anymore.
+			 */
+			from->objects[i].item->flags |= assign_flag;
+			continue;
+		}
+
+		list[nr_commits] = (struct commit *)from_one;
+		if (parse_commit(list[nr_commits]) ||
+		    list[nr_commits]->generation < min_generation) {
+			result = 0;
+			goto cleanup;
+		}
+
+		nr_commits++;
 	}
 
-	QSORT(list, from->nr, compare_commits_by_gen);
+	QSORT(list, nr_commits, compare_commits_by_gen);
 
-	for (i = 0; i < from->nr; i++) {
+	for (i = 0; i < nr_commits; i++) {
 		/* DFS from list[i] */
 		struct commit_list *stack = NULL;
 
@@ -570,8 +593,10 @@ int can_all_from_reach_with_flag(struct object_array *from,
 		while (stack) {
 			struct commit_list *parent;
 
-			if (stack->item->object.flags & with_flag) {
+			if (stack->item->object.flags & (with_flag | RESULT)) {
 				pop_commit(&stack);
+				if (stack)
+					stack->item->object.flags |= RESULT;
 				continue;
 			}
 
@@ -603,10 +628,12 @@ int can_all_from_reach_with_flag(struct object_array *from,
 	}
 
 cleanup:
-	for (i = 0; i < from->nr; i++) {
-		clear_commit_marks(list[i], RESULT);
-		clear_commit_marks(list[i], assign_flag);
-	}
+	clear_commit_marks_many(nr_commits, list, RESULT | assign_flag);
+	free(list);
+
+	for (i = 0; i < from->nr; i++)
+		from->objects[i].item->flags &= ~assign_flag;
+
 	return result;
 }