Vulnerability CVE-2024-35958
Published: 2024-05-20

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.

 References:
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
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