CVE-2021-47523 — IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr

Affected: Linux

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().

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CVE-2021-47523 — IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr