linux-kernel - Re: [v3] powerpc/8xx: fix possible object reference leak

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Date:   Mon, 22 Apr 2019 00:18:56 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Peng Hao <peng.hao2@....com.cn>, vitb@...nel.crashing.org,
        benh@...nel.crashing.org, paulus@...ba.org, christophe.leroy@....fr
Cc:     linuxppc-dev@...ts.ozlabs.org, Wen Yang <wen.yang99@....com.cn>,
        linux-kernel@...r.kernel.org
Subject: Re: [v3] powerpc/8xx: fix possible object reference leak

On Tue, 2019-03-26 at 10:29:51 UTC, Peng Hao wrote:
> 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>
> Suggested-by: Michael Ellerman <mpe@...erman.id.au>
> 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

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/cc76404feaed597bb4f5234d34d3f49e

cheers