static void check_clr_rcv_irq(struct smi_info *smi_info)
{
	u8 enables = 0;
	int rv;

	rv = get_global_enables(smi_info, &enables);
	if (!rv) {
		if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0)
			/* Already clear, should work ok. */
			return;

		enables &= ~IPMI_BMC_RCV_MSG_INTR;
		rv = set_global_enables(smi_info, enables);
	}

	if (rv < 0) {
		dev_err(smi_info->io.dev,
			"Cannot check clearing the rcv irq: %d\n", rv);
		return;
	}

	if (rv) {
		/*
		 * An error when setting the event buffer bit means
		 * clearing the bit is not supported.
		 */
		dev_warn(smi_info->io.dev,
			 "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n");
		smi_info->cannot_disable_irq = true;
	}
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.