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> --- 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
