linux-kernel - Re: [PATCH v4.19.y 0/2] btrfs: Fix for CVE-2019-18885

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Date:   Thu, 11 Jun 2020 13:20:27 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vikash Bansal <bvikas@...are.com>
Cc:     stable@...r.kernel.org, srivatsab@...are.com,
        srivatsa@...il.mit.edu, amakhalov@...are.com, srinidhir@...are.com,
        anishs@...are.com, vsirnapalli@...are.com, akaher@...are.com,
        clm@...com, josef@...icpanda.com, dsterba@...e.com,
        anand.jain@...cle.com, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4.19.y 0/2] btrfs: Fix for CVE-2019-18885

On Tue, Jun 09, 2020 at 12:20:16PM +0530, Vikash Bansal wrote:
> CVE Description:
> NVD Site Link: https://nvd.nist.gov/vuln/detail?vulnId=CVE-2019-18885
> 
> It was discovered that the btrfs file system in the Linux kernel did not
> properly validate metadata, leading to a NULL pointer dereference. An
> attacker could use this to specially craft a file system image that, when
> mounted, could cause a denial of service (system crash).
> 
> [PATCH v4.19.y 1/2]:
> Backporting of upsream commit 09ba3bc9dd15:
> btrfs: merge btrfs_find_device and find_device
> 
> [PATCH v4.19.y 2/2]:
> Backporting of upstream commit 62fdaa52a3d0:
> btrfs: Detect unbalanced tree with empty leaf before crashing
> 
> On NVD site link of "commit 09ba3bc9dd150457c506e4661380a6183af651c1" 
> was given as the fix for this CVE. But the issue was still reproducible.
> So had to apply patch "Commit 62fdaa52a3d00a875da771719b6dc537ca79fce1"
> to fix the issue.

Looks good, now queued up,t hanks.

greg k-h