Subject: CVE-2024-35958: net: ena: Fix incorrect descriptor free behavior

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

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

net: ena: Fix incorrect descriptor free behavior

ENA has two types of TX queues:
- queues which only process TX packets arriving from the network stack
- queues which only process TX packets forwarded to it by XDP_REDIRECT
  or XDP_TX instructions

The ena_free_tx_bufs() cycles through all descriptors in a TX queue
and unmaps + frees every descriptor that hasn't been acknowledged yet
by the device (uncompleted TX transactions).
The function assumes that the processed TX queue is necessarily from
the first category listed above and ends up using napi_consume_skb()
for descriptors belonging to an XDP specific queue.

This patch solves a bug in which, in case of a VF reset, the
descriptors aren't freed correctly, leading to crashes.

The Linux kernel CVE team has assigned CVE-2024-35958 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 5.6 with commit 548c4940b9f1 and fixed in 5.10.216 with commit b26aa765f743
	Issue introduced in 5.6 with commit 548c4940b9f1 and fixed in 5.15.156 with commit fdfbf54d128a
	Issue introduced in 5.6 with commit 548c4940b9f1 and fixed in 6.1.87 with commit 19ff8fed3338
	Issue introduced in 5.6 with commit 548c4940b9f1 and fixed in 6.6.28 with commit 5c7f2240d983
	Issue introduced in 5.6 with commit 548c4940b9f1 and fixed in 6.8.7 with commit c31baa07f013
	Issue introduced in 5.6 with commit 548c4940b9f1 and fixed in 6.9 with commit bf02d9fe0063

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-35958
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/net/ethernet/amazon/ena/ena_netdev.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/b26aa765f7437e1bbe8db4c1641b12bd5dd378f0
	https://git.kernel.org/stable/c/fdfbf54d128ab6ab255db138488f9650485795a2
	https://git.kernel.org/stable/c/19ff8fed3338898b70b2aad831386c78564912e1
	https://git.kernel.org/stable/c/5c7f2240d9835a7823d87f7460d8eae9f4e504c7
	https://git.kernel.org/stable/c/c31baa07f01307b7ae05f3ce32b89d8e2ba0cc1d
	https://git.kernel.org/stable/c/bf02d9fe00632d22fa91d34749c7aacf397b6cde