linux-kernel - Re: w35und: fixed nasty stack overflow, I can actually ssh over this

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Message-ID: <20080506123936.GA4777@elf.ucw.cz>
Date:	Tue, 6 May 2008 14:39:36 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	kernel list <linux-kernel@...r.kernel.org>, kaszak@...il.com,
	lcostantino@...il.com, linux-wireless@...r.kernel.org
Subject: Re: w35und: fixed nasty stack overflow, I can actually ssh over
	this

Hi!
> > Removed nasty stack overflow, and got transmit of big packets to work. 
> > I can now actually do ssh over softmac-based driver.
> > 
> > Unindent code to make it more readable.
> 
> > --- a/arch/x86/kernel/traps_32.c
> > +++ b/arch/x86/kernel/traps_32.c
> > @@ -146,11 +146,16 @@ static inline unsigned long print_contex
> >  				unsigned long *stack, unsigned long bp,
> >  				const struct stacktrace_ops *ops, void *data)
> >  {
> > +	int max = 5;
> >  	struct stack_frame *frame = (struct stack_frame *)bp;
> >  
> >  	while (valid_stack_ptr(tinfo, stack, sizeof(*stack))) {
> >  		unsigned long addr;
> >  
> > +		if (!max)
> > +			return;
> > +		max--;
> > +
> 
> hm, you got into an infinite loop here, right? Could you please send 
> this bit as a separate patch - and i guess it should use 
> kstack_depth_to_print instead of '5'?

No, sorry, this should not have been in this patch. (And no, this is
not the overflow I was talking about).

What happened to me is that current oops is too long even for vga=1,
and I was trying to see where it dies.

I was trying to only print first few lines of the backtrace, but then
I fix the nasty bug...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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