linux-cve-announce - CVE-2021-47631: ARM: davinci: da850-evm: Avoid NULL pointer dereference

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Message-ID: <2025022643-CVE-2021-47631-bcc8@gregkh>
Date: Wed, 26 Feb 2025 02:53:42 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2021-47631: ARM: davinci: da850-evm: Avoid NULL pointer dereference

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

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

ARM: davinci: da850-evm: Avoid NULL pointer dereference

With newer versions of GCC, there is a panic in da850_evm_config_emac()
when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:

Unable to handle kernel NULL pointer dereference at virtual address 00000020
pgd = (ptrval)
[00000020] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1
Hardware name: Generic DT based system
PC is at da850_evm_config_emac+0x1c/0x120
LR is at do_one_initcall+0x50/0x1e0

The emac_pdata pointer in soc_info is NULL because davinci_soc_info only
gets populated on davinci machines but da850_evm_config_emac() is called
on all machines via device_initcall().

Move the rmii_en assignment below the machine check so that it is only
dereferenced when running on a supported SoC.

The Linux kernel CVE team has assigned CVE-2021-47631 to this issue.


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

	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 4.9.311 with commit c06f476e5b74bcabb8c4a2fba55864a37e62843b
	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 4.14.276 with commit a12b356d45cbb6e8a1b718d1436b3d6239a862f3
	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 4.19.239 with commit c64e2ed5cc376e137e572babfd2edc38b2cfb61b
	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 5.4.190 with commit 89931d4762572aaee6edbe5673d41f8082de110f
	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 5.10.112 with commit 0a312ec66a03133d28570f07bc52749ccfef54da
	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 5.15.35 with commit 0940795c6834fbe7705acc5c3d4b2f7a5f67527a
	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 5.17.4 with commit c5628533a3ece64235d04fe11ec44d2be99e423d
	Issue introduced in 2.6.33 with commit bae105879f2f2404155da6f50b3636193d228a62 and fixed in 5.18 with commit 83a1cde5c74bfb44b49cb2a940d044bb2380f4ea

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-2021-47631
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:
	arch/arm/mach-davinci/board-da850-evm.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/c06f476e5b74bcabb8c4a2fba55864a37e62843b
	https://git.kernel.org/stable/c/a12b356d45cbb6e8a1b718d1436b3d6239a862f3
	https://git.kernel.org/stable/c/c64e2ed5cc376e137e572babfd2edc38b2cfb61b
	https://git.kernel.org/stable/c/89931d4762572aaee6edbe5673d41f8082de110f
	https://git.kernel.org/stable/c/0a312ec66a03133d28570f07bc52749ccfef54da
	https://git.kernel.org/stable/c/0940795c6834fbe7705acc5c3d4b2f7a5f67527a
	https://git.kernel.org/stable/c/c5628533a3ece64235d04fe11ec44d2be99e423d
	https://git.kernel.org/stable/c/83a1cde5c74bfb44b49cb2a940d044bb2380f4ea