Re: [PATCH 1/1] of: properly check for error returned by fdt_get_name()

[Rob Herring <robh@kernel.org>]

On Sun, 04 Apr 2021 22:28:45 -0500, frowand.list@gmail.com wrote:
> From: Frank Rowand <frank.rowand@sony.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@roeck-us.net>
> Signed-off-by: Frank Rowand <frank.rowand@sony.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!