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" <k...@microsoft.com> Cc: Haiyang Zhang <haiya...@microsoft.com> Cc: Wei Liu <wei....@kernel.org> Cc: Dexuan Cui <de...@microsoft.com> Cc: Lorenzo Pieralisi <lpieral...@kernel.org> Cc: "Krzysztof Wilczyński" <k...@linux.com> Cc: Rob Herring <r...@kernel.org> Cc: Bjorn Helgaas <bhelg...@google.com> Cc: linux-hyp...@vger.kernel.org Cc: linux-...@vger.kernel.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- 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
