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Date: Thu, 5 Jul 2018 19:03:01 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Zubin Mithra <zsm@chromium.org>
Cc: stable@vger.kernel.org, groeck@chromium.org, dvyukov@google.com
Subject: Re: 897366537f("genhd: Fix use after free in __blkdev_get()")
Message-ID: <20180705170301.GD4349@kroah.com>
References: <20180625210441.GA227992@zsmcros.c.googlers.com>
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On Mon, Jun 25, 2018 at 05:04:42PM -0400, Zubin Mithra wrote:
> Hello,
> 
> Syzkaller has reported a crash here[1] for a UAF in disk_unblock_events.
> 
> Could the following patches be applied in order to 4.14?
> 
> 517bf3c30("block: don't look at the struct device dev_t in disk_devt")
> 8ddcd653("block: introduce GENHD_FL_HIDDEN")
> f0fba398fe("block: avoid null pointer dereference on null disk")
> d52987b5("genhd: Fix leaked module reference for NVME devices")
> 9df6c2991("genhd: Add helper put_disk_and_module()")
> 89736653("genhd: Fix use after free in __blkdev_get()")

You do know about:
	git show -s --abbrev-commit --abbrev=12 --pretty=format:"%h (\"%s\")%n"
right?  That makes this a lot more uniform...

Anyway, can you resend this request and cc: the developers and
maintainers of the above patches, so I can get their approval to
backport such things?

thanks,

greg k-h