linux-kernel - Re: [PATCH v2] powerpc: 82xx: fix uninitialized pointers with free attribute

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <a2964be2-bd18-49bb-b279-28402b65b51e@kernel.org>
Date: Tue, 2 Dec 2025 17:01:26 +0100
From: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>
To: Ally Heev <allyheev@...il.com>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>,
 Nicholas Piggin <npiggin@...il.com>, Krzysztof Kozlowski <krzk@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH v2] powerpc: 82xx: fix uninitialized pointers with free
 attribute



Le 16/11/2025 à 15:25, Ally Heev a écrit :
> [Vous ne recevez pas souvent de courriers de allyheev@...il.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> Uninitialized pointers with `__free` attribute can cause undefined
> behavior as the memory allocated to the pointer is freed automatically
> when the pointer goes out of scope.
> 
> powerpc/km82xx doesn't have any bugs related to this as of now, but,
> it is better to initialize and assign pointers with `__free` attribute
> in one statement to ensure proper scope-based cleanup
> 
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fall%2FaPiG_F5EBQUjZqsl%40stanley.mountain%2F&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cffef37bc0fba4c2c5d4d08de251c0ccd%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638988999594823658%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=spMNfEUgHH43vUqoyG3EAs99MzCC5bMnlWUvsBa0o6Y%3D&reserved=0
> Signed-off-by: Ally Heev <allyheev@...il.com>

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@...nel.org>

Fixes: 4aa5cc1e0012 ("powerpc-km82xx.c: replace of_node_put() with __free")

> ---
> Changes in v2:
> - updated commit description
> - Link to v1: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fr%2F20251104-aheev-uninitialized-free-attr-km82xx-v1-1-903be69f2cd4%40gmail.com&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cffef37bc0fba4c2c5d4d08de251c0ccd%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638988999594847235%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ehJtEL%2F3GHIwW2mPuiD730V%2FDgkuDvudK2gM%2F72QIDE%3D&reserved=0
> ---
>   arch/powerpc/platforms/82xx/km82xx.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/82xx/km82xx.c b/arch/powerpc/platforms/82xx/km82xx.c
> index 99f0f0f4187672614f4f8ad46ab7906f7ad8078b..4ad223525e893c0de15540db2b2c4d239d6d841e 100644
> --- a/arch/powerpc/platforms/82xx/km82xx.c
> +++ b/arch/powerpc/platforms/82xx/km82xx.c
> @@ -27,8 +27,8 @@
> 
>   static void __init km82xx_pic_init(void)
>   {
> -       struct device_node *np __free(device_node);
> -       np = of_find_compatible_node(NULL, NULL, "fsl,pq2-pic");
> +       struct device_node *np __free(device_node) = of_find_compatible_node(NULL,
> +               NULL, "fsl,pq2-pic");
> 
>          if (!np) {
>                  pr_err("PIC init: can not find cpm-pic node\n");
> 
> ---
> base-commit: c9cfc122f03711a5124b4aafab3211cf4d35a2ac
> change-id: 20251104-aheev-uninitialized-free-attr-km82xx-00c4cb7c3d69
> 
> Best regards,
> --
> Ally Heev <allyheev@...il.com>
>