linux-kernel - Re: [PATCH v2] powerpc/8xx: fix possible object reference leak

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Message-ID: <1846dc49-e691-cd24-2439-26d92f634036@c-s.fr>
Date:   Mon, 25 Mar 2019 09:50:38 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Peng Hao <peng.hao2@....com.cn>, vitb@...nel.crashing.org,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au
Cc:     Wen Yang <wen.yang99@....com.cn>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc/8xx: fix possible object reference leak



Le 25/03/2019 à 18:11, Peng Hao a écrit :
> From: Wen Yang <wen.yang99@....com.cn>
> 
> The call to of_find_compatible_node returns a node pointer with refcount
> incremented thus it must be explicitly decremented after the last
> usage.
> irq_domain_add_linear also calls of_node_get to increase refcount,
> so irq_domain will not be affected when it is released.
> 
> Detected by coccinelle with the following warnings:
> ./arch/powerpc/platforms/8xx/pic.c:158:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 136, but without a corresponding object release within this function.
> 
> Fixes: a8db8cf0d894 ("irq_domain: Replace irq_alloc_host() with
> revmap-specific initializers")
> Signed-off-by: Wen Yang <wen.yang99@....com.cn>
> Suggested-by: Christophe Leroy <christophe.leroy@....fr>
> Reviewed-by: Peng Hao <peng.hao2@....com.cn>

Reviewed-by: Christophe Leroy <christophe.leroy@....fr>

> Cc: Vitaly Bordug <vitb@...nel.crashing.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-kernel@...r.kernel.org
> ---
>   arch/powerpc/platforms/8xx/pic.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/8xx/pic.c b/arch/powerpc/platforms/8xx/pic.c
> index 8d5a25d..4453df6 100644
> --- a/arch/powerpc/platforms/8xx/pic.c
> +++ b/arch/powerpc/platforms/8xx/pic.c
> @@ -153,9 +153,7 @@ int mpc8xx_pic_init(void)
>   	if (mpc8xx_pic_host == NULL) {
>   		printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
>   		ret = -ENOMEM;
> -		goto out;
>   	}
> -	return 0;
>   
>   out:
>   	of_node_put(np);
>