Messages in this thread | | | Date | Fri, 16 Apr 2004 22:27:38 +0100 | From | Dave Jones <> | Subject | Re: baycom_par dereference before check. |
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On Fri, Apr 16, 2004 at 10:25:41PM +0100, viro@parcelfarce.linux.theplanet.co.uk wrote:
> > +++ linux-2.6.5/drivers/net/hamradio/baycom_par.c 2004-04-16 22:19:33.000000000 +0100 > > @@ -272,9 +272,13 @@ > > static void par96_interrupt(int irq, void *dev_id, struct pt_regs *regs) > > { > > struct net_device *dev = (struct net_device *)dev_id; > > - struct baycom_state *bc = netdev_priv(dev); > > + struct baycom_state *bc; > > > > - if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC) > > + if (!dev) > > + return; > > + > > + bc = netdev_priv(dev); > > That's OK - netdev_priv(p) just adds a constant offset to p; no problem > with doing that to NULL.
Good point. Still doesn't strike me as particularly nice though.
Dave
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