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

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Message-Id: <1253903053.26639.3.camel@localhost>
Date:	Fri, 25 Sep 2009 20:24:13 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	linux-kernel@...r.kernel.org
Cc:	Len Brown <lenb@...nel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>
Subject: Re: [PATCH] acpi: fix null pointer deference of hardware_id string

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?

> 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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