linux-cve-announce - CVE-2024-50145: octeon_ep: Add SKB allocation failures handling in __octep_oq_process

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Message-ID: <2024110744-CVE-2024-50145-10b6@gregkh>
Date: Thu,  7 Nov 2024 10:34:45 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50145: octeon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()

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

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

octeon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()

build_skb() returns NULL in case of a memory allocation failure so handle
it inside __octep_oq_process_rx() to avoid NULL pointer dereference.

__octep_oq_process_rx() is called during NAPI polling by the driver. If
skb allocation fails, keep on pulling packets out of the Rx DMA queue: we
shouldn't break the polling immediately and thus falsely indicate to the
octep_napi_poll() that the Rx pressure is going down. As there is no
associated skb in this case, don't process the packets and don't push them
up the network stack - they are skipped.

Helper function is implemented to unmmap/flush all the fragment buffers
used by the dropped packet. 'alloc_failures' counter is incremented to
mark the skb allocation error in driver statistics.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

The Linux kernel CVE team has assigned CVE-2024-50145 to this issue.

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

	Issue introduced in 5.19 with commit 37d79d059606 and fixed in 6.1.115 with commit 09ce491112bb
	Issue introduced in 5.19 with commit 37d79d059606 and fixed in 6.6.59 with commit c2d2dc4f88bb
	Issue introduced in 5.19 with commit 37d79d059606 and fixed in 6.11.6 with commit 2dedcb6f99f4
	Issue introduced in 5.19 with commit 37d79d059606 and fixed in 6.12-rc5 with commit eb592008f79b

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-2024-50145
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/marvell/octeon_ep/octep_rx.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/09ce491112bbf0b866e2638d3e961c1c73d1f00b
	https://git.kernel.org/stable/c/c2d2dc4f88bb3cfc4f3cc320fd3ff51b0ae5b0ea
	https://git.kernel.org/stable/c/2dedcb6f99f4c1a11944e7cc35dbeb9b18a5cbac
	https://git.kernel.org/stable/c/eb592008f79be52ccef88cd9a5249b3fc0367278