linux-kernel - Re: [PATCH] acpi: fix null pointer deference of hardware

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Message-Id: <1254016198.17697.19.camel@minggr.sh.intel.com>
Date:	Sun, 27 Sep 2009 09:49:58 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] acpi: fix null pointer deference of hardware_id string

On Sat, 2009-09-26 at 02:24 +0800, Thomas Meyer wrote:
> Am Donnerstag, den 13.08.2009, 11:12 +0800 schrieb Lin Ming:
> > From: Lin Ming <ming.m.lin@...el.com>
> > Date: Thu, 13 Aug 2009 11:04:47 +0800
> 
> Another month, another git repository...
> 
> Are there any reasons why the patch below didn't land in linus' git
> tree?

A similar patch from Bjorn Helgaas is in Linus' tree.

ACPICA: fixup after acpi_get_object_info() change
b24715027aab5e586c4ab1d035f3e543307dea69

Lin Ming

> 
> > Subject: [PATCH] acpi: fix null pointer deference of hardware_id string
> > 
> > This regression was caused by commit ed44482
> > "ACPICA: Major update for acpi_get_object_info external interface"
> > 
> > Don't need to set hardware_id string \0 terminated here,
> > acpi_get_object_info already handles it.
> > 
> > Tested-by: Thomas Meyer <thomas@...3r.de>
> > Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> > ---
> >  drivers/char/agp/hp-agp.c         |    6 ++++--
> >  drivers/pci/hotplug/acpiphp_ibm.c |    1 -
> >  2 files changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/char/agp/hp-agp.c b/drivers/char/agp/hp-agp.c
> > index 7bead4c..d83c4a8 100644
> > --- a/drivers/char/agp/hp-agp.c
> > +++ b/drivers/char/agp/hp-agp.c
> > @@ -492,8 +492,10 @@ zx1_gart_probe (acpi_handle obj, u32 depth, void *context, void **ret)
> >  		status = acpi_get_object_info(handle, &info);
> >  		if (ACPI_SUCCESS(status)) {
> >  			/* TBD check _CID also */
> > -			info->hardware_id.string[sizeof(info->hardware_id.length)-1] = '\0';
> > -			match = (strcmp(info->hardware_id.string, "HWP0001") == 0);
> > +			if (info->valid & ACPI_VALID_HID)
> > +				match = !strcmp(info->hardware_id.string, "HWP0001");
> > +			else
> > +				match = 0;
> >  			kfree(info);
> >  			if (match) {
> >  				status = hp_acpi_csr_space(handle, &sba_hpa, &length);
> > diff --git a/drivers/pci/hotplug/acpiphp_ibm.c b/drivers/pci/hotplug/acpiphp_ibm.c
> > index a9d926b..e7be66d 100644
> > --- a/drivers/pci/hotplug/acpiphp_ibm.c
> > +++ b/drivers/pci/hotplug/acpiphp_ibm.c
> > @@ -406,7 +406,6 @@ static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
> >  			__func__, status);
> >  		return retval;
> >  	}
> > -	info->hardware_id.string[sizeof(info->hardware_id.length) - 1] = '\0';
> >  
> >  	if (info->current_status && (info->valid & ACPI_VALID_HID) &&
> >  			(!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||
> > 
> > 
> 

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