void mark_parents_uninteresting(struct commit *commit)
{
	struct commit_list *parents = NULL, *l;

	for (l = commit->parents; l; l = l->next)
		commit_list_insert(l->item, &parents);

	while (parents) {
		struct commit *commit = parents->item;
		l = parents;
		parents = parents->next;
		free(l);

		while (commit) {
			/*
			 * A missing commit is ok iff its parent is marked
			 * uninteresting.
			 *
			 * We just mark such a thing parsed, so that when
			 * it is popped next time around, we won't be trying
			 * to parse it and get an error.
			 */
			if (!has_sha1_file(commit->object.sha1))
				commit->object.parsed = 1;

			if (commit->object.flags & UNINTERESTING)
				break;

			commit->object.flags |= UNINTERESTING;

			/*
			 * Normally we haven't parsed the parent
			 * yet, so we won't have a parent of a parent
			 * here. However, it may turn out that we've
			 * reached this commit some other way (where it
			 * wasn't uninteresting), in which case we need
			 * to mark its parents recursively too..
			 */
			if (!commit->parents)
				break;

			for (l = commit->parents->next; l; l = l->next)
				commit_list_insert(l->item, &parents);
			commit = commit->parents->item;
		}
	}
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.