On Mon, Feb 13, 2012 at 11:20:36AM +0200, Meelis Roos wrote:
> > Try the following patch. I suspect the new of_alias_scan() isn't careful
> > enough about which properties it dereferences:
> >
> > ---
> >
> > diff --git a/drivers/of/base.c b/drivers/of/base.c
> > index 133908a..9188caa 100644
> > --- a/drivers/of/base.c
> > +++ b/drivers/of/base.c
> > @@ -1174,6 +1174,10 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
> > !strcmp(pp->name, "linux,phandle"))
> > continue;
> >
> > + /* Check for null value or non-strings (no null termination) */
> > + if (!pp->value || strnlen(pp->value, pp->length) == pp->length)
> > + continue;
> > +
> > np = of_find_node_by_path(pp->value);
> > if (!np)
> > continue;
> >
>
> Yes, it probably gets past this problem but oopses in a different place:
>
> [ 0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 3.2.30 2002/10/25 14:03'
> [ 0.000000] PROMLIB: Root node compatible:
> [ 0.000000] Initializing cgroup subsys cpu
> [ 0.000000] Linux version 3.3.0-rc3-00188-g3ec1e88-dirty (mroos@korvits) (gcc version 4.6.2 (Debian 42
> [ 0.000000] debug: ignoring loglevel setting.
> [ 0.000000] bootconsole [earlyprom0] enabled
> [ 0.000000] ARCH: SUN4U
> [ 0.000000] Ethernet address: 08:00:20:b6:ee:e2
> [ 0.000000] Kernel: Using 4 locked TLB entries for main kernel image.
> [ 0.000000] Remapping the kernel... done.
> [ 0.000000] Unable to handle kernel NULL pointer dereference
> [ 0.000000] tsk->{mm,active_mm}->context = 0000000000000000
> [ 0.000000] tsk->{mm,active_mm}->pgd = fffff800008c77d0
> [ 0.000000] \|/ ____ \|/
> [ 0.000000] "@'/ .. \`@"
> [ 0.000000] /_| \__/ |_\
> [ 0.000000] \__U_/
> [ 0.000000] swapper(0): Oops [#1]
> [ 0.000000] TSTATE: 0000000080e01606 TPC: 0000000000645810 TNPC: 0000000000645814 Y: 00000037 Not d
> [ 0.000000] TPC: <of_find_node_by_phandle+0x30/0x60>
Ugh; that looks bad. If it failed there, then the global device node list
is corrupted. I hate to ask you this, but would you be able to git bisect to
narrow down the commit that causes the problem?
g.
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