linux-kernel - Re: [PATCH] powerpc: Remove double free

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Date:   Wed, 15 May 2019 11:26:03 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     "Tobin C. Harding" <tobin@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: Remove double free

kobject_put() released index_dir->kobj

but who will release 'index' ?

Christophe

Le 15/05/2019 à 11:07, Tobin C. Harding a écrit :
> kfree() after kobject_put().  Who ever wrote this was on crack.
> 
> Fixes: 7e8039795a80 ("powerpc/cacheinfo: Fix kobject memleak")
> Signed-off-by: Tobin C. Harding <tobin@...nel.org>
> ---
> 
> FTR
> 
> git log --pretty=format:"%h%x09%an%x09%ad%x09%s" | grep 7e8039795a80
> 7e8039795a80	Tobin C. Harding	Tue Apr 30 11:09:23 2019 +1000	powerpc/cacheinfo: Fix kobject memleak
> 
>   arch/powerpc/kernel/cacheinfo.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/cacheinfo.c b/arch/powerpc/kernel/cacheinfo.c
> index f2ed3ef4b129..862e2890bd3d 100644
> --- a/arch/powerpc/kernel/cacheinfo.c
> +++ b/arch/powerpc/kernel/cacheinfo.c
> @@ -767,7 +767,6 @@ static void cacheinfo_create_index_dir(struct cache *cache, int index,
>   				  cache_dir->kobj, "index%d", index);
>   	if (rc) {
>   		kobject_put(&index_dir->kobj);
> -		kfree(index_dir);
>   		return;
>   	}
>   
>