static void __anal_reg_list(RCore *core, int type, int bits, char mode) {
	RReg *hack = core->dbg->reg;
	const char *use_color;
	int use_colors = r_config_get_i (core->config, "scr.color");
	if (use_colors) {
#undef ConsP
#define ConsP(x) (core->cons && core->cons->pal.x)? core->cons->pal.x
		use_color = ConsP (creg) : Color_BWHITE;
	} else {
		use_color = NULL;
	}
	if (bits < 0) {
		bits = 0;
	} else if (!bits) {
		bits = core->anal->bits;
	}
	if (core->anal) {
		core->dbg->reg = core->anal->reg;
		if (core->anal->cur && core->anal->cur->arch) {
			/* workaround for thumb */
			if (!strcmp (core->anal->cur->arch, "arm") && bits == 16) {
				bits = 32;
			}
			/* workaround for 6502 */
			if (!strcmp (core->anal->cur->arch, "6502") && bits == 8) {
				r_debug_reg_list (core->dbg, R_REG_TYPE_GPR, 16, mode, use_color); // XXX detect which one is current usage
			}
			if (!strcmp (core->anal->cur->arch, "avr") && bits == 8) {
				r_debug_reg_list (core->dbg, R_REG_TYPE_GPR, 16, mode, use_color); // XXX detect which one is current usage
			}
		}
	}

	if (mode == '=') {
		int pcbits = 0;
		const char *pcname = r_reg_get_name (core->anal->reg, R_REG_NAME_PC);
		RRegItem *reg = r_reg_get (core->anal->reg, pcname, 0);
		if (bits != reg->size) {
			pcbits = reg->size;
		}
		if (pcbits) {
			r_debug_reg_list (core->dbg, R_REG_TYPE_GPR, pcbits, 2, use_color); // XXX detect which one is current usage
		}
	}
	r_debug_reg_list (core->dbg, type, bits, mode, use_color);
	core->dbg->reg = hack;
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.