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Date: Thu, 13 Sep 2007 02:03:46 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Micah Gruber <micah.gruber@...il.com> Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, jgarzik@...ox.com, Grant Grundler <grundler@...isc-linux.org> Subject: Re: [CORRECTION][PATCH] Fix a potential NULL pointer dereference in uli526x_interrupt() in drivers/net/tulip/uli526x.c On Tue, 04 Sep 2007 16:14:06 +0800 Micah Gruber <micah.gruber@...il.com> wrote: > This patch fixes a potential null dereference bug where we dereference dev before a null check. This patch simply moves the dereferencing after the null check. > > Signed-off-by: Micah Gruber <micah.gruber@...il.com> > --- > > --- a/drivers/net/tulip/uli526x.c > +++ b/drivers/net/tulip/uli526x.c > @@ -663,7 +663,7 @@ > { > struct net_device *dev = dev_id; > struct uli526x_board_info *db = netdev_priv(dev); > - unsigned long ioaddr = dev->base_addr; > + unsigned long ioaddr; > unsigned long flags; > > if (!dev) { > @@ -671,6 +671,8 @@ > return IRQ_NONE; > } > > + ioaddr = dev->base_addr; > + > spin_lock_irqsave(&db->lock, flags); > outl(0, ioaddr + DCR7); > I suspect the fix we want is: --- a/drivers/net/tulip/uli526x.c~fix-a-potential-null-pointer-dereference-in-uli526x_interrupt +++ a/drivers/net/tulip/uli526x.c @@ -666,11 +666,6 @@ static irqreturn_t uli526x_interrupt(int unsigned long ioaddr = dev->base_addr; unsigned long flags; - if (!dev) { - ULI526X_DBUG(1, "uli526x_interrupt() without DEVICE arg", 0); - return IRQ_NONE; - } - spin_lock_irqsave(&db->lock, flags); outl(0, ioaddr + DCR7); _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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