QTNTernary(QTNode *in)
{
	int			i;

	/* since this function recurses, it could be driven to stack overflow. */
	check_stack_depth();

	if (in->valnode->type != QI_OPR)
		return;

	for (i = 0; i < in->nchild; i++)
		QTNTernary(in->child[i]);

	for (i = 0; i < in->nchild; i++)
	{
		QTNode	   *cc = in->child[i];

		if (cc->valnode->type == QI_OPR && in->valnode->qoperator.oper == cc->valnode->qoperator.oper)
		{
			int			oldnchild = in->nchild;

			in->nchild += cc->nchild - 1;
			in->child = (QTNode **) repalloc(in->child, in->nchild * sizeof(QTNode *));

			if (i + 1 != oldnchild)
				memmove(in->child + i + cc->nchild, in->child + i + 1,
						(oldnchild - i - 1) * sizeof(QTNode *));

			memcpy(in->child + i, cc->child, cc->nchild * sizeof(QTNode *));
			i += cc->nchild - 1;

			if (cc->flags & QTN_NEEDFREE)
				pfree(cc->valnode);
			pfree(cc);
		}
	}
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.