linux-kernel - Re: [PATCH] btrfs: Fix potential null pointer deref

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Message-ID: <def529e1-3d7a-aee1-f4dd-d4d3d46b9f2a@toxicpanda.com>
Date:   Mon, 21 Sep 2020 15:16:27 -0400
From:   Josef Bacik <josef@...icpanda.com>
To:     Alex Dewar <alex.dewar90@...il.com>
Cc:     Alex Dewar <a.dewar@...sex.ac.uk>, Chris Mason <clm@...com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: Fix potential null pointer deref

On 9/21/20 3:12 PM, Alex Dewar wrote:
> In btrfs_destroy_inode(), the variable root may be NULL, but the check
> for this takes place after its value has already been dereferenced to
> access its fs_info member. Move the dereference operation to later in
> the function.
> 
> Fixes: a6dbd429d8dd ("Btrfs: fix panic when trying to destroy a newly allocated")
> Addresses-Coverity: CID 1497103: Null pointer dereferences (REVERSE_INULL)
> Signed-off-by: Alex Dewar <a.dewar@...sex.ac.uk>

Reviewed-by: Josef Bacik <josef@...icpanda.com>

Thanks,

Josef