linux-cve-announce - CVE-2021-47671: can: etas_es58x: es58x_rx_err

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Message-ID: <2025041735-CVE-2021-47671-9b1a@gregkh>
Date: Thu, 17 Apr 2025 20:01:37 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2021-47671: can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path

In es58x_rx_err_msg(), if can->do_set_mode() fails, the function
directly returns without calling netif_rx(skb). This means that the
skb previously allocated by alloc_can_err_skb() is not freed. In other
terms, this is a memory leak.

This patch simply removes the return statement in the error branch and
let the function continue.

Issue was found with GCC -fanalyzer, please follow the link below for
details.

The Linux kernel CVE team has assigned CVE-2021-47671 to this issue.


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

	Issue introduced in 5.13 with commit 8537257874e949a59c834cecfd5a063e11b64b0b and fixed in 5.14.19 with commit 4f389e1276a5389c92cef860c9fde8e1c802a871
	Issue introduced in 5.13 with commit 8537257874e949a59c834cecfd5a063e11b64b0b and fixed in 5.15.3 with commit 7eb0881aec26099089f12ae850aebd93190b1dfe
	Issue introduced in 5.13 with commit 8537257874e949a59c834cecfd5a063e11b64b0b and fixed in 5.16 with commit d9447f768bc8c60623e4bb3ce65b8f4654d33a50

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-2021-47671
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/can/usb/etas_es58x/es58x_core.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/4f389e1276a5389c92cef860c9fde8e1c802a871
	https://git.kernel.org/stable/c/7eb0881aec26099089f12ae850aebd93190b1dfe
	https://git.kernel.org/stable/c/d9447f768bc8c60623e4bb3ce65b8f4654d33a50