Re: Null dereference errors in the kernel

From: Peter Osterlund
Date: Tue Jul 18 2006 - 18:38:45 EST

Dave Jones <davej@xxxxxxxxxx> writes:

> On Mon, Jul 17, 2006 at 08:49:19PM -0700, Thomas Dillig wrote:
> > 144 drivers/char/agp/ati-agp.c
> > NULL dereference of variable "ati_generic_private.gatt_pages" in
> > function call (drivers/char/agp/ati-agp.c:ati_free_gatt_pages).
> I think this is a false positive.

I don't think so. If the 'entry = kzalloc(...)' fails at line 125, the
code will set tables to NULL and retval to != 0. ati_free_gatt_pages()
will then be called with .gatt_pages == NULL and .num_tables > 0. This
will trigger a NULL pointer dereference in ati_free_gatt_pages().

Peter Osterlund - petero2@xxxxxxxxx
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