linux-kernel - Re: [PATCH 1/1] of: properly check for error returned by fdt_get

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Message-ID: <20210406192120.GA2150527@robh.at.kernel.org>
Date:   Tue, 6 Apr 2021 14:21:20 -0500
From:   Rob Herring <robh@...nel.org>
To:     frowand.list@...il.com
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Subject: Re: [PATCH 1/1] of: properly check for error returned by
 fdt_get_name()

On Sun, 04 Apr 2021 22:28:45 -0500, frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> fdt_get_name() returns error values via a parameter pointer
> instead of in function return.  Fix check for this error value
> in populate_node() and callers of populate_node().
> 
> Chasing up the caller tree showed callers of various functions
> failing to initialize the value of pointer parameters that
> can return error values.  Initialize those values to NULL.
> 
> The bug was introduced by
> commit e6a6928c3ea1 ("of/fdt: Convert FDT functions to use libfdt")
> but this patch can not be backported directly to that commit
> because the relevant code has further been restructured by
> commit dfbd4c6eff35 ("drivers/of: Split unflatten_dt_node()")
> 
> The bug became visible by triggering a crash on openrisc with:
> commit 79edff12060f ("scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9")
> as reported in:
> https://lore.kernel.org/lkml/20210327224116.69309-1-linux@roeck-us.net/
> 
> Fixes: commit 79edff12060f ("scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9")
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> 
> ---
> 
> This patch papers over the unaligned pointer passed to
> of_fdt_unflatten_tree() bug that Guenter reported in
> https://lore.kernel.org/lkml/20210327224116.69309-1-linux@roeck-us.net/
> 
> I will create a separate patch to fix that problem.
> 
>  drivers/of/fdt.c      | 36 +++++++++++++++++++++++-------------
>  drivers/of/overlay.c  |  2 +-
>  drivers/of/unittest.c | 15 ++++++++++-----
>  3 files changed, 34 insertions(+), 19 deletions(-)
> 

Applied, thanks!