static void LYHandleFIG(HTStructured * me, const BOOL *present,
			STRING2PTR value,
			int isobject,
			int imagemap,
			const char *id,
			const char *src,
			int convert,
			int start,
			BOOL *intern_flag GCC_UNUSED)
{
    if (start == TRUE) {
	me->inFIG = TRUE;
	if (me->inA) {
	    SET_SKIP_STACK(HTML_A);
	    HTML_end_element(me, HTML_A, NULL);
	}
	if (!isobject) {
	    LYEnsureDoubleSpace(me);
	    LYResetParagraphAlignment(me);
	    me->inFIGwithP = TRUE;
	} else {
	    me->inFIGwithP = FALSE;
	    HTML_put_character(me, ' ');	/* space char may be ignored */
	}
	if (non_empty(id)) {
	    if (present && convert) {
		CHECK_ID(HTML_FIG_ID);
	    } else
		LYHandleID(me, id);
	}
	me->in_word = NO;
	me->inP = FALSE;

	if (clickable_images && non_empty(src)) {
	    char *href = NULL;

	    StrAllocCopy(href, src);
	    CHECK_FOR_INTERN(*intern_flag, href);
	    LYLegitimizeHREF(me, &href, TRUE, TRUE);
	    if (*href) {
		me->CurrentA = HTAnchor_findChildAndLink(me->node_anchor,	/* Parent */
							 NULL,	/* Tag */
							 href,	/* Addresss */
							 INTERN_CHK(*intern_flag));	/* Type */
		HText_beginAnchor(me->text, me->inUnderline, me->CurrentA);
		if (me->inBoldH == FALSE)
		    HText_appendCharacter(me->text, LY_BOLD_START_CHAR);
		HTML_put_string(me, (isobject
				     ? (imagemap
					? "(IMAGE)"
					: "(OBJECT)")
				     : "[FIGURE]"));
		if (me->inBoldH == FALSE)
		    HText_appendCharacter(me->text, LY_BOLD_END_CHAR);
		HText_endAnchor(me->text, 0);
		HTML_put_character(me, '-');
		HTML_put_character(me, ' ');	/* space char may be ignored */
		me->in_word = NO;
	    }
	    FREE(href);
	}
    } else {			/* handle end tag */
	if (me->inFIGwithP) {
	    LYEnsureDoubleSpace(me);
	} else {
	    HTML_put_character(me, ' ');	/* space char may be ignored */
	}
	LYResetParagraphAlignment(me);
	me->inFIGwithP = FALSE;
	me->inFIG = FALSE;
	change_paragraph_style(me, me->sp->style);	/* Often won't really change */
	if (me->List_Nesting_Level >= 0) {
	    UPDATE_STYLE;
	    HText_NegateLineOne(me->text);
	}
    }
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.