Re: [PATCH] btrfs: Fix potential null pointer deref

[David Sterba]

On Mon, Sep 21, 2020 at 08:12:44PM +0100, 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@xxxxxxxxxxxx>

For some reason my replies did not get to linux-btrfs@, so for the
record the changes has been folded to the patch "btrfs: clean BTRFS_I
usage in btrfs_destroy_inode".