From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Peng Hao <peng.hao2@zte.com.cn>,
vitb@kernel.crashing.org, benh@kernel.crashing.org,
paulus@samba.org, mpe@ellerman.id.au
Cc: Wen Yang <wen.yang99@zte.com.cn>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] powerpc/8xx: fix possible object reference leak
Date: Mon, 25 Mar 2019 09:50:38 +0100 [thread overview]
Message-ID: <1846dc49-e691-cd24-2439-26d92f634036@c-s.fr> (raw)
In-Reply-To: <1553533919-75527-1-git-send-email-peng.hao2@zte.com.cn>
Le 25/03/2019 à 18:11, Peng Hao a écrit :
> From: Wen Yang <wen.yang99@zte.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@zte.com.cn>
> Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr>
> Reviewed-by: Peng Hao <peng.hao2@zte.com.cn>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
> Cc: Vitaly Bordug <vitb@kernel.crashing.org>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-kernel@vger.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);
>
next prev parent reply other threads:[~2019-03-25 8:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 17:11 [PATCH v2] powerpc/8xx: fix possible object reference leak Peng Hao
2019-03-25 8:50 ` Christophe Leroy [this message]
2019-03-25 10:47 ` Michael Ellerman
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