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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH 4/4] fs: free unused dentries
Date: Tue, 15 Sep 2020 09:12:15 +0200	[thread overview]
Message-ID: <20200915071215.GZ4498@pengutronix.de> (raw)
In-Reply-To: <da8f70a1-921f-ad94-ffb1-855eb4004f86@pengutronix.de>

On Tue, Sep 15, 2020 at 07:25:15AM +0200, Ahmad Fatoum wrote:
> Hello Sascha,
> 
> On 9/14/20 3:06 PM, Sascha Hauer wrote:
> > So far we only ever freed dentries when the filesystem they are on is
> > unmounted. With this patch we actually trust reference counting and free
> > the dentries once the reference count hits zero.
> 
> Unless I revert this patch, I run into a crash doing:
> 
> dd if=/dev/zero of=barebox.env count=1
> ./barebox --image=barebox.env
> barebox@barebox sandbox:/ saveenv
> saving environment

"saveenv" answers with: "saveenv: No such file or directory". Did you
mean to do a "saveenv /dev/fd0"?

> barebox@barebox sandbox:/ reset
> =================================================================
> ==894761==ERROR: AddressSanitizer: heap-use-after-free on address 0x60e000005d70 at pc 0x5617cfde210a bp 0x7ffff89957d0 sp 0x7ffff89957c8

I can't reproduce this here unfortunately.

Sascha


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  reply	other threads:[~2020-09-15  7:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-14 13:06 [PATCH 1/4] fs: don't free device in remove callback Sascha Hauer
2020-09-14 13:06 ` [PATCH 2/4] fs: Drop unnecessary dput() Sascha Hauer
2020-09-14 13:06 ` [PATCH 3/4] fs: Fix use after free Sascha Hauer
2020-09-14 13:06 ` [PATCH 4/4] fs: free unused dentries Sascha Hauer
2020-09-15  5:25   ` Ahmad Fatoum
2020-09-15  7:12     ` Sascha Hauer [this message]
2020-09-15  8:01       ` Ahmad Fatoum
2020-09-15 13:12         ` Sascha Hauer
2020-09-15 13:28           ` Ahmad Fatoum
2020-09-16 10:43             ` Ahmad Fatoum

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