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 memoryn);
	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().

Affected Software

References

• https://git.kernel.org/stable/c/2c08271f4ed0e24633b3f81ceff61052b9d45efc
• https://git.kernel.org/stable/c/60a8b5a1611b4a26de4839ab9c1fc2a9cf3e17c1
• https://git.kernel.org/stable/c/834d0fb978643eaf09da425de197cc16a7c2761b