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    SubjectRe: aic7(censored) use after free in 2.5.66
    Zwane Mwaikambo <zwane@linuxpower.ca> wrote:
    >
    > On Mon, 31 Mar 2003, Andrew Morton wrote:
    >
    > > The corruption was at offset 52 decimal into struct ahc_linux_device.
    > > Without knowing your config it is hard for me to work out what you have at
    > > that offset. Rebuild your kernel with -g and do:
    > >
    > > (gdb) p/d &(((struct ahc_linux_device *)0)->maxtags)
    > >
    > > until you find which member is at offset 52.
    > >
    > > Something incremented that field by one after it was freed.
    >
    > (gdb) p/d &(((struct ahc_linux_device *)0)->timer.lock)
    > $4 = 52
    >
    > That would be a lock free it appears.

    OK, so that's a spin_unlock(&timer->lock) in the timer code itself. Your
    patch will fix that up.

    We just need to be sure that the del_timer_sync() is not called while holding
    any locks which would prevent the timer handler from completing.


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