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Message-ID: <747f819a-9b1a-55c9-c0cf-860c75e5855c@c-s.fr> Date: Tue, 26 Mar 2019 07:05:25 +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 v3] powerpc/8xx: fix possible object reference leak Le 26/03/2019 à 11:29, Peng Hao a écrit : Could you fix your clock or clock setup ? This emails appears to have been sent today at 11:29 (Paris Time ie GMT+1) allthough it is only 7am at the time being. Christophe > 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 > --- > v3->v2: set ret to zero explicitly. > v2->v1: add a Fixes tag. > > arch/powerpc/platforms/8xx/pic.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/platforms/8xx/pic.c b/arch/powerpc/platforms/8xx/pic.c > index 8d5a25d..9993998 100644 > --- a/arch/powerpc/platforms/8xx/pic.c > +++ b/arch/powerpc/platforms/8xx/pic.c > @@ -153,9 +153,9 @@ 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; > + > + ret = 0; > > out: > of_node_put(np); >
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