pseudo-merge: fix various memory leaks

Fix various memory leaks hit by the pseudo-merge machinery. These leaks
are exposed by t5333, but plugging them does not yet make the whole test
suite pass.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

pack-bitmap-write.c

@@ -64,6 +64,12 @@ static void free_pseudo_merge_commit_idx(struct pseudo_merge_commit_idx *idx)
 	free(idx);
 }
 
+static void pseudo_merge_group_release_cb(void *payload, const char *name UNUSED)
+{
+	pseudo_merge_group_release(payload);
+	free(payload);
+}
+
 void bitmap_writer_free(struct bitmap_writer *writer)
 {
 	uint32_t i;
@@ -82,6 +88,8 @@ void bitmap_writer_free(struct bitmap_writer *writer)
 	kh_foreach_value(writer->pseudo_merge_commits, idx,
 			 free_pseudo_merge_commit_idx(idx));
 	kh_destroy_oid_map(writer->pseudo_merge_commits);
+	string_list_clear_func(&writer->pseudo_merge_groups,
+			       pseudo_merge_group_release_cb);
 
 	for (i = 0; i < writer->selected_nr; i++) {
 		struct bitmapped_commit *bc = &writer->selected[i];

pack-bitmap.c

@@ -1390,8 +1390,8 @@ static struct bitmap *find_objects(struct bitmap_index *bitmap_git,
 		}
 
 		base = bitmap_new();
-		if (!cascade_pseudo_merges_1(bitmap_git, base, roots_bitmap))
-			bitmap_free(roots_bitmap);
+		cascade_pseudo_merges_1(bitmap_git, base, roots_bitmap);
+		bitmap_free(roots_bitmap);
 	}
 
 	/*

pseudo-merge.c

@@ -97,6 +97,25 @@ static void pseudo_merge_group_init(struct pseudo_merge_group *group)
 	group->stable_size = DEFAULT_PSEUDO_MERGE_STABLE_SIZE;
 }
 
+void pseudo_merge_group_release(struct pseudo_merge_group *group)
+{
+	struct hashmap_iter iter;
+	struct strmap_entry *e;
+
+	regfree(group->pattern);
+	free(group->pattern);
+
+	strmap_for_each_entry(&group->matches, &iter, e) {
+		struct pseudo_merge_matches *matches = e->value;
+		free(matches->stable);
+		free(matches->unstable);
+		free(matches);
+	}
+	strmap_clear(&group->matches, 0);
+
+	free(group->merges);
+}
+
 static int pseudo_merge_config(const char *var, const char *value,
 			       const struct config_context *ctx,
 			       void *cb_data)

pseudo-merge.h

@@ -51,6 +51,8 @@ struct pseudo_merge_group {
 	timestamp_t stable_threshold;
 };
 
+void pseudo_merge_group_release(struct pseudo_merge_group *group);
+
 struct pseudo_merge_matches {
 	struct commit **stable;
 	struct commit **unstable;