CVE-2021-47523

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

IB/hfi1: Fix leak of rcvhdrtaildummykvaddr

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 hfi1allocdevdata() and the deallocation to hfi1freedevdata().