Re: [PATCH] modpost: detect unterminated device id lists

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To: Satyam Sharma <satyam@...>

Cc: Satyam Sharma <satyam.sharma@...>, Kees Cook <kees@...>, Greg KH <greg@...>, Alexey Dobriyan <adobriyan@...>, Jeff Garzik <jeff@...>, <linux-kernel@...>, Ben Collins <bcollins@...>, Michael Wu <flamingice@...>, Mauro Carvalho Chehab <mchehab@...>

Subject: Re: [PATCH] modpost: detect unterminated device id lists

Date: Monday, September 17, 2007 - 5:50 pm

On Tue, 18 Sep 2007 03:15:14 +0530 (IST)
Satyam Sharma <satyam@infradead.org> wrote:

quoted text> 
> 
> On Sun, 16 Sep 2007, Andrew Morton wrote:
> 
> > On Mon, 17 Sep 2007 05:54:45 +0530 "Satyam Sharma" <satyam.sharma@gmail.com> wrote:
> > 
> > > On 9/17/07, Andrew Morton <akpm@linux-foundation.org> wrote:
> > > >
> > > > I'm getting this:
> > > >
> > > > rusb2/pvrusb2: struct usb_device_id is 20 bytes.  The last of 3 is:
> > > > 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> > > > 0x00 0x00 0x00 0x00 0x00
> > > > FATAL: drivers/media/video/pvrusb2/pvrusb2: struct usb_device_id is not terminated
> > > > with a NULL entry!
> > > >
> > > > ("rusb2/pvrusb2" ??)
> > > 
> > > Hmm? Are you sure you didn't see any "drivers/media/video/pv" before the
> > > "rusb2/pvrusb2" bit?
> > 
> > Fairly.  I looked twice.
> 
> "drivers/media/video/pvrusb2/pvrusb2" comes out correctly here ...
> 
> 
> > > Looking at Kees' patch (and the existing code), I've no
> > > clue how/why this should happen ... will try to reproduce here ...
> > > 
> > > 
> > > > but:
> > > >
> > > > struct usb_device_id pvr2_device_table[] = {
> > > >         [PVR2_HDW_TYPE_29XXX] = { USB_DEVICE(0x2040, 0x2900) },
> > > >         [PVR2_HDW_TYPE_24XXX] = { USB_DEVICE(0x2040, 0x2400) },
> > > >         { USB_DEVICE(0, 0) },
> > > > };
> > > >
> > > > looks OK?
> > > >
> > > > Using plain old "{ }" shut the warning up.
> > > 
> > > USB_DEVICE(0, 0) is not empty termination, actually, and this looks like
> > > a genuine bug caught by the patch. As that dump shows, USB_DEVICE(0, 0)
> > > assigns "0x03 0x00" (in little endian) to usb_device_id.match_flags. And
> > > I don't think the USB code treats such an entry as an empty entry (?)
> > > 
> > > Interestingly, the "USB_DEVICE(0, 0)" thing is absent from latest -git
> > > tree and also in my copy of 23-rc4-mm1 -- so this looks like something
> > > you must've merged recently.
> > 
> > git-dvb very carefully does
> > 
> > --- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c~git-dvb
> > +++ a/drivers/media/video/pvrusb2/pvrusb2-hdw.c
> > @@ -44,7 +44,7 @@
> >  struct usb_device_id pvr2_device_table[] = {
> >  		[PVR2_HDW_TYPE_29XXX] = { USB_DEVICE(0x2040, 0x2900) },
> >  		[PVR2_HDW_TYPE_24XXX] = { USB_DEVICE(0x2040, 0x2400) },
> > -       { }
> > +       { USB_DEVICE(0, 0) },
> > };
> > 	 
> > MODULE_DEVICE_TABLE(usb, pvr2_device_table);
> 
> Ok, this is a false positive indeed, the core USB code does in fact
> treat such an entry as an empty entry (usb_match_id() tests only the
> .idVendor, .bDeviceClass, .bInterfaceClass and .driver_info members
> for non-zero and not the .match_flags member).
> 
> However, a quick-grep-and-glance tells us that none of the other 2213
> occurrences of USB_DEVICE() in the tree ever do this "(0,0)" thing,
> so it does make sense to change this one to a simple "{ }" as well --
> that's clearer style anyway, and the "standard" way to empty-terminate
> in the rest of the tree, if nothing else.
> 

yeah, I think so.  Mauro, could you please drop that change?
-
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Messages in current thread:

[PATCH] pci: fix unterminated pci_device_id lists, Kees Cook, (Wed Sep 12, 2:41 am)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Jeff Garzik, (Wed Sep 12, 7:10 am)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Alexey Dobriyan, (Wed Sep 12, 7:48 am)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Greg KH, (Wed Sep 12, 5:53 pm)

[PATCH] modpost: detect unterminated device id lists, Kees Cook, (Wed Sep 12, 8:49 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Satyam Sharma, (Sun Sep 16, 9:22 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Kees Cook, (Sun Sep 16, 11:45 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Andrew Morton, (Mon Sep 17, 2:48 am)

Re: [PATCH] modpost: detect unterminated device id lists, Andrew Morton, (Sun Sep 16, 6:14 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Satyam Sharma, (Sun Sep 16, 8:24 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Andrew Morton, (Mon Sep 17, 2:46 am)

Re: [PATCH] modpost: detect unterminated device id lists, Satyam Sharma, (Mon Sep 17, 5:45 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Andrew Morton, (Mon Sep 17, 5:50 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Mauro Carvalho Chehab, (Mon Sep 17, 7:36 pm)

Re: [PATCH] modpost: detect unterminated device id lists, Andrew Morton, (Wed Sep 12, 9:21 pm)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Andrew Morton, (Wed Sep 12, 7:08 pm)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Alexey Dobriyan, (Thu Sep 13, 2:34 am)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Sam Ravnborg, (Thu Sep 13, 2:58 am)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Jeff Garzik, (Thu Sep 13, 2:42 am)

Re: [PATCH] pci: fix unterminated pci_device_id lists, Jan Engelhardt, (Sat Sep 15, 5:01 am)


linux-kernel:
Glauber de Oliveira Costa	[PATCH 08/79] [PATCH] use identify_boot_cpu
David Woodhouse	[PATCH v2] Stop pmac_zilog from abusing 8250's device numbers.
Greg Kroah-Hartman	[PATCH 002/196] Chinese: rephrase English introduction in HOWTO
Jeremy Fitzhardinge	[PATCH 30 of 31] xen: no need for domU to worry about MCE/MCA
git:

openbsd-misc:

linux-netdev:
Gerrit Renker	[PATCH 03/37] dccp: List management for new feature negotiation
Jarek Poplawski	[PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().
David Miller	[GIT]: Networking
Frans Pop	svc: failed to register lockdv1 RPC service (errno 97).

Re: [PATCH] modpost: detect unterminated device id lists

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