Re: NULL pointer dereference in 3.3-rc6

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Hi Greg,

On Mon, Mar 19, 2012 at 04:52, Greg Ungerer <gerg@xxxxxxxxxxxx> wrote:
On 19/03/12 06:03, Geert Uytterhoeven wrote:
Given that a1 is zero, and d1 is 64, it looks like it's the movesl at
5e14 that caused the problem:

  5e14:       0e91 2800       movesl %d2,%a1@
  5e18:       2400            movel %d0,%d2
  5e1a:       608c            bras 5da8<berr_040cleanup+0x144>


This corresponds to

        case BA_SIZE_LONG:
                res = put_user(wbd, (int __user *)wba);

in do_040writeback1(). So wba is zero. Oops...

Did this work properly in 3.2?

Actually I had booted the same kernel image just after I compiled it 2 weeks
ago, and at that time I didn't get the oops.

If so can you git bisect it to find a problem patch?

Will retry to see whether it's (sort-of) reproducible...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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