Re: kernel BUG in __put_mtd_device

Re: kernel BUG in __put_mtd_device

[Richard Weinberger]

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----- Ursprüngliche Mail -----
> Von: "Zheng Zhang" <zheng.zhang@email.ucr.edu>
> An: "Miquel Raynal" <miquel.raynal@bootlin.com>, "richard" <richard@nod.at>, "Vignesh Raghavendra" <vigneshr@ti.com>,
> "linux-mtd" <linux-mtd@lists.infradead.org>, "linux-kernel" <linux-kernel@vger.kernel.org>
> Gesendet: Montag, 31. Juli 2023 01:27:09
> Betreff: kernel BUG in __put_mtd_device

> Miquel, Richard, Vignesh  and  to whom it may concern:
> 
> Hello! We have found a bug in MTD driver in the Linux kernel version 6.2.0
> by Syzkaller with our own templates.
> It's triggered for multiple times. Unfortunately, it doesn't generate a
> reproducer.
> Attached is the report, log generated by syzkaller.
> Please let me know if there is any additional information that I can
> provide to help debug this issue.

Isn't this related to "[PATCH] mtd: fix use-after-free in mtd release"?

Thanks,
//richard

Re: kernel BUG in __put_mtd_device

[Miquel Raynal]

Hi Richard,

richard@nod.at wrote on Mon, 31 Jul 2023 07:35:15 +0200 (CEST):

> ----- Ursprüngliche Mail -----
> > Von: "Zheng Zhang" <zheng.zhang@email.ucr.edu>
> > An: "Miquel Raynal" <miquel.raynal@bootlin.com>, "richard" <richard@nod.at>, "Vignesh Raghavendra" <vigneshr@ti.com>,
> > "linux-mtd" <linux-mtd@lists.infradead.org>, "linux-kernel" <linux-kernel@vger.kernel.org>
> > Gesendet: Montag, 31. Juli 2023 01:27:09
> > Betreff: kernel BUG in __put_mtd_device  
> 
> > Miquel, Richard, Vignesh  and  to whom it may concern:
> > 
> > Hello! We have found a bug in MTD driver in the Linux kernel version 6.2.0
> > by Syzkaller with our own templates.
> > It's triggered for multiple times. Unfortunately, it doesn't generate a
> > reproducer.
> > Attached is the report, log generated by syzkaller.
> > Please let me know if there is any additional information that I can
> > provide to help debug this issue.  
> 
> Isn't this related to "[PATCH] mtd: fix use-after-free in mtd release"?

Yes, probably, we received two patches regarding the same issue, but so
far no agreement on them because none fully fixes the issue
apparently...

Thanks,
Miquèl

Re: kernel BUG in __put_mtd_device

[Miquel Raynal]

Hi Zheng,

zheng.zhang@email.ucr.edu wrote on Mon, 31 Jul 2023 16:58:49 -0700:

> Could you tell me the base Linux version of this patch? It seems that the
> context is not consistent with 6.2 or newest version v6.5.rc4
> Thanks

mtd/next, where new changes have been brought to these functions

https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git/log/?h=mtd/next

Thanks,
Miquèl