CVE-2021-47523

In the Linux kernel, the following vulnerability has been resolved:

IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr

This buffer is currently allocated in hfi1_init():

if (reinit)
	ret = init_after_reset(dd);
else
	ret = loadtime_init(dd);
if (ret)
	goto done;

/* allocate dummy tail memory for all receive contexts */
dd->rcvhdrtail_dummy_kvaddr = dma_alloc_coherent(&dd->pcidev->dev,
						 sizeof(u64),
						 &dd->rcvhdrtail_dummy_dma,
						 GFP_KERNEL);

if (!dd->rcvhdrtail_dummy_kvaddr) {
	dd_dev_err(dd, "cannot allocate dummy tail memory\n");
	ret = -ENOMEM;
	goto done;
}

The reinit triggered path will overwrite the old allocation and leak it.

Fix by moving the allocation to hfi1_alloc_devdata() and the deallocation to hfi1_free_devdata().

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.