On Fri, Sep 22, 2023 at 10:52:57AM -0700, Kees Cook wrote: > Prepare for the coming implementation by GCC and Clang of the __counted_by > attribute. Flexible array members annotated with __counted_by can have > their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS > (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > As found with Coccinelle[1], add __counted_by for struct hv_dr_state. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx> > Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> > Cc: Wei Liu <wei.liu@xxxxxxxxxx> > Cc: Dexuan Cui <decui@xxxxxxxxxxxxx> > Cc: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx> > Cc: "Krzysztof Wilczyński" <kw@xxxxxxxxx> > Cc: Rob Herring <robh@xxxxxxxxxx> > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > Cc: linux-hyperv@xxxxxxxxxxxxxxx > Cc: linux-pci@xxxxxxxxxxxxxxx > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> Thanks -- Gustavo > --- > drivers/pci/controller/pci-hyperv.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c > index bed3cefdaf19..30c7dfeccb16 100644 > --- a/drivers/pci/controller/pci-hyperv.c > +++ b/drivers/pci/controller/pci-hyperv.c > @@ -545,7 +545,7 @@ struct hv_pcidev_description { > struct hv_dr_state { > struct list_head list_entry; > u32 device_count; > - struct hv_pcidev_description func[]; > + struct hv_pcidev_description func[] __counted_by(device_count); > }; > > struct hv_pci_dev { > -- > 2.34.1 > >
