On Thu, Oct 25, 2007 at 09:31:02AM +0200, Takashi Iwai wrote:
> At Wed, 24 Oct 2007 16:30:37 -0700,
> Mark Gross wrote:
> >
> > On Tue, Oct 23, 2007 at 10:57:51AM +0200, Takashi Iwai wrote:
> > > Fix possible array overflow:
> > >
> > > drivers/pci/intel-iommu.c: In function ‘dmar_get_fault_reason’:
> > > drivers/pci/intel-iommu.c:753: warning: array subscript is above array bounds
> > > drivers/pci/intel-iommu.c: In function ‘iommu_page_fault’:
> > > drivers/pci/intel-iommu.c:753: warning: array subscript is above array bounds
> > >
> > > Signed-off-by: Takashi Iwai <[email protected]>
> > >
> > > ---
> > > drivers/pci/intel-iommu.c | 4 ++--
> > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
> > > index b3d7031..e4b0a0d 100644
> > > --- a/drivers/pci/intel-iommu.c
> > > +++ b/drivers/pci/intel-iommu.c
> > > @@ -749,8 +749,8 @@ static char *fault_reason_strings[] =
> > >
> > > char *dmar_get_fault_reason(u8 fault_reason)
> > > {
> > > - if (fault_reason > MAX_FAULT_REASON_IDX)
> > > - return fault_reason_strings[MAX_FAULT_REASON_IDX];
> > > + if (fault_reason >= MAX_FAULT_REASON_IDX)
> > > + return fault_reason_strings[MAX_FAULT_REASON_IDX - 1];
> >
> > This looks like what the code meant to implement.
>
> I think not. The size of fault_reason_strings[] is
> MAX_FAULT_REASON_IDX, not + 1. So gcc warning is correct.
> Maybe the main problem is that the constant name is confusing...
Yup, GCC warning is correct. the size of fault_reason_strings[]
is MAX_FAULT_REASON_IDX and hence the max array that can be
referenced is [MAX_FAULT_REASON_IDX -1], hence the fix by
Takashi is correct.
-Anil
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