linux-kernel - Re: [PATCH] acpi: Fix memory leak on acpi_scan_init

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Date:	Wed, 15 May 2013 22:48:27 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Toshi Kani <toshi.kani@...com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCH] acpi: Fix memory leak on acpi_scan_init_hotplug() error path

On Wednesday, May 15, 2013 12:21:11 PM Toshi Kani wrote:
> On Wed, 2013-05-15 at 17:49 +0100, Catalin Marinas wrote:
> > Following commit 6b772e8f9 (ACPI: Update PNPID match handling for
> > notify), the acpi_scan_init_hotplug() calls acpi_set_pnp_ids() which
> > allocates acpi_hardware_id and copies a few strings (kstrdup). If the
> > devices does not have hardware_id set, the function exits without
> > freeing the previously allocated ids (and kmemleak complains). This
> > patch calls simply changes 'return' on error to a 'goto out' which calls
> > acpi_free_pnp_ids().
> > 
> > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> > Reported-by: Larry Finger <Larry.Finger@...inger.net>
> > Cc: Toshi Kani <toshi.kani@...com>
> 
> Reviewed-by: Toshi Kani <toshi.kani@...com>
> Tested-by: Toshi Kani <toshi.kani@...com>
> 
> Testing was performed by adding a fake ACPI object with _UID only.

Applied to linux-pm.git/linux-next as v3.10-rc2 material.

Thanks,
Rafael


> > ---
> >  drivers/acpi/scan.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> > index fe158fd..c1bc608 100644
> > --- a/drivers/acpi/scan.c
> > +++ b/drivers/acpi/scan.c
> > @@ -1785,7 +1785,7 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type)
> >  	acpi_set_pnp_ids(handle, &pnp, type);
> >  
> >  	if (!pnp.type.hardware_id)
> > -		return;
> > +		goto out;
> >  
> >  	/*
> >  	 * This relies on the fact that acpi_install_notify_handler() will not
> > @@ -1800,6 +1800,7 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type)
> >  		}
> >  	}
> >  
> > +out:
> >  	acpi_free_pnp_ids(&pnp);
> >  }
> >  
> 
> 
> --
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-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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