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DragonFly bugs List (threaded) for 2004-05
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Re: ucom panic

From: Eirik Nygaard <eirikn@xxxxxxxxxxxx>
Date: Thu, 27 May 2004 15:26:22 +0200

On Thu, May 27, 2004 at 08:15:44PM +0900, YONETANI Tomokazu wrote:
> Hello.
> After the device layer rollup commit, ucom driver panics when
> I disconnect from a tip(1) session. Attached is the backtrace
> from the panic. The problem is that ucomclose() is releasing
> tp->t_dev too early, and ucomstop() passes it to minor()
> without chacking the value, resulting in a NULL-pointer dereference.
> I'm not sure how to fix this, but I think you have to push down
> the following block in usbclose()
> 	if (tp->t_dev) {
> 		release_dev(tp->t_dev);
> 		tp->t_dev = NULL;
> 	}
> down to somewhere after the label `quit:'.

That fix looks right as far as I can tell. Have you tried it out?
If not, could you do it, and let me know if it does work so I can commit

Eirik Nygaard
eirikn@xxxxxxxxxxxx    Never let a computer know you're in a hurry.

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