On 2020-07-06 16:52, Mark Johnston wrote:
Author: markj
Date: Mon Jul 6 14:52:09 2020
New Revision: 362962
URL: https://svnweb.freebsd.org/changeset/base/362962
Log:
iflib: Fix handling of mbuf cluster allocation failures.
When refilling an rx freelist, make sure we only update the hardware
producer index if at least one cluster was allocated. Otherwise the
NIC is programmed to write a previously used cluster, typically
resulting in a use-after-free when packet data is written by the
hardware.
Also make sure that we don't update the fragment index cursor if the
last allocation attempt didn't succeed. For at least Intel drivers,
iflib assumes that the consumer index and fragment index cursor stay in
lockstep, but this assumption was violated in the face of cluster
allocation failures.
Hi Mark,
Thanks for working on this. I can confirm the issue Mellanox has seen in
this area is solved by your patch.
--HPS
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