linux-kernel - Re: [PATCH 2/2] of: overlay: fix target

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Date:   Thu, 21 Nov 2019 11:37:15 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        pantelis.antoniou@...sulko.com, robh+dt@...nel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vincent Whitchurch <rabinv@...s.com>
Subject: Re: [PATCH 2/2] of: overlay: fix target_path memory leak

Hi Rob,

On 11/18/19 7:28 AM, Vincent Whitchurch wrote:
> target_path is used as a temporary buffer in dup_and_fixup_symbol_prop()
> and should be freed even in the success path.
> 
> This was detected by kmemleak.
> 
>  unreferenced object 0x8598f6c0 (size 64):
>    backtrace:
>      __kmalloc_track_caller+0x17d/0x228
>      kvasprintf+0x2b/0x64
>      kasprintf+0x15/0x20
>      add_changeset_property+0x225/0x364
>      of_overlay_fdt_apply+0x42d/0x6b4
>      ...
> 
> Fixes: e0a58f3e08d4b7fa ("of: overlay: remove a dependency on device node full_name")
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> ---
>  drivers/of/overlay.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> index 5f8869e2a8b3..59455322a130 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -261,6 +261,8 @@ static struct property *dup_and_fixup_symbol_prop(
>  
>  	of_property_set_flag(new_prop, OF_DYNAMIC);
>  
> +	kfree(target_path);
> +
>  	return new_prop;
>  
>  err_free_new_prop:
> 

Reviewed-by: Frank Rowand <frowand.list@...il.com>

I would suggest changing the subject to:

   of: overlay: dup_and_fixup_symbol_prop() memory leak

but I am also fine with you not changing the subject.

-Frank