On Tue, 2002-02-26 at 20:54, Dave Jones wrote:
> On Tue, Feb 26, 2002 at 08:26:18PM +0100, petter wahlman wrote:
> > +++ linux-2.4.18-pw/drivers/isdn/eicon/eicon_mod.c Mon Feb 25
>
> > - if (user)
> > + if (user) {
> > + spin_unlock_irqrestore(&eicon_lock,
> > flags);
> > copy_to_user(p, skb->data, cnt);
> > + spin_lock_irqsave(&eicon_lock, flags);
> > + }
>
> What happens if something else adds/removes to card->statq, or
> frees the skb after you drop the lock? I'm not familiar with
> this code, but from a quick look, it looks like this introduces
> a race no ?
>
Yes, it will introduce a new race.
I did not actually intend to send this unfinished patch, but fscked up
:)
Anyway, calling copy_to_user while holding a spinlock is defiantly a bad
idea.
> --
> | Dave Jones. http://www.codemonkey.org.uk
> | SuSE Labs
>
Petter Wahlman.
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This archive was generated by hypermail 2b29 : Thu Feb 28 2002 - 21:00:32 EST