linux-kernel - Re: [origin tree boot crash] NULL pointer dereference, IP: [<ffffffff82b07130>] ibm_find_acpi

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Date:	Thu, 24 Sep 2009 10:13:40 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Ingo Molnar <mingo@...e.hu>, bjorn.helgaas@...com
Cc:	Len Brown <lenb@...nel.org>,
	"Moore, Robert" <robert.moore@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [origin tree boot crash] NULL pointer dereference, IP:
 [<ffffffff82b07130>] ibm_find_acpi_device+0x5c/0xf5

On Thu, 2009-09-24 at 09:58 +0800, Lin Ming wrote:
> On Thu, 2009-09-24 at 09:35 +0800, Lin Ming wrote:
> > On Thu, 2009-09-24 at 05:30 +0800, Ingo Molnar wrote:
> > > > commit 15b8dd53f5ffaf8e2d9095c423f713423f576c0f
> > > > Date:   Mon Jun 29 13:39:29 2009 +0800
> > > >
> > > >     ACPICA: Major update for acpi_get_object_info external interface
> > > 
> > > this one is causing boot crashes in -tip testing:
> > 
> > Hi,
> > 
> > Could you please try below commit at linux-acpi-2.6/release branch.
> 
> Oh, sorry, commit 718fb0d was already in -tip testing.
> 
> (add Bjorn Helgaas <bjorn.helgaas@...com>)

Bjorn,

hp-agp.c need the same fix.
Could you refresh your patch with this one?

Thanks,

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) ||


> 
> Below patch should fix the crash.
> http://patchwork.kernel.org/patch/49090/ 
> 
> Subject: [PATCH v3 01/17] ACPICA: fixup after acpi_get_object_info() change
> 
> Commit 15b8dd53f5ffa changed info->hardware_id from a static array to
> a pointer.  If hardware_id is non-NULL, it points to a NULL-terminated
> string, so we don't need to terminate it explicitly.  However, it may
> be NULL; in that case, we *can't* add a NULL terminator.
> 
> This causes a NULL pointer dereference oops for devices without _HID.
> 
> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
> CC: Lin Ming <ming.m.lin@...el.com>
> CC: Bob Moore <robert.moore@...el.com>
> CC: Gary Hade <garyhade@...ibm.com>
> ---
>  drivers/pci/hotplug/acpiphp_ibm.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> 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) ||
> 
> 
> ---
> Lin Ming
> 
> > 
> > commit 718fb0de8ff88f71b3b91a8ee8e42e60c88e5128
> > Author: Hugh Dickins <hugh.dickins@...cali.co.uk>
> > Date:   Thu Aug 6 23:18:12 2009 +0000
> > 
> >     ACPI: fix NULL bug for HID/UID string
> >     
> >     acpi_device->pnp.hardware_id and unique_id are now allocated pointers,
> >     replacing the previous arrays.  acpi_device_install_notify_handler()
> >     oopsed on the NULL hid when probing the video device, and perhaps other
> >     uses are vulnerable too.  So initialize those pointers to empty strings
> >     when there is no hid or uid.  Also, free hardware_id and unique_id when
> >     when acpi_device is going to be freed.
> >     
> >     http://bugzilla.kernel.org/show_bug.cgi?id=14096
> >     
> >     Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
> >     Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> >     Signed-off-by: Len Brown <len.brown@...el.com>
> > 
> > Thanks,
> > Lin Ming
> 

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