linux-kernel - Re: usb: cdc-acm: BUG kmalloc-128 Poison overwritten

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Date:   Thu, 25 Feb 2021 10:57:50 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Bruno Thomsen <bruno.thomsen@...il.com>
Cc:     linux-usb@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Bruno Thomsen <bth@...strup.com>,
        Lars Alex Pedersen <laa@...strup.com>
Subject: Re: usb: cdc-acm: BUG kmalloc-128 Poison overwritten

Am Mittwoch, den 24.02.2021, 16:21 +0100 schrieb Bruno Thomsen:

Hi,

> No, this is not a regression from 5.10. It seems that many attempts to
> fix cdc-acm in the 5.x kernel series have failed to fix the root cause of
> these oops. I have not seen this on 4.14 and 4.19, but I have observed
> it on at least 5.3 and newer kernels in slight variations.
> I guess this is because cdc-acm is very common in the embedded
> ARM world and rarely used on servers or laptops. Combined with
> ARM devices still commonly use 4.x LTS kernels. Not sure if
> hardening options on the kernel has increased change of reproducing
> oops.

OK, so this is not an additional problem.
According to your logs, an URB that should have been killed wasn't.

> I am ready to test new patches and will continue to report oops

Could you test the attached patches?

	Regards
		Oliver


View attachment "0001-cdc-wdm-untangle-a-circular-dependency-between-callb.patch" of type "text/x-patch" (3403 bytes)

View attachment "0002-cdc-acm-untangle-a-circular-dependency-between-callb.patch" of type "text/x-patch" (3680 bytes)