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SubjectRe: [PATCH] serial: 8250_pci1xxxx: Annotate struct pci1xxxx_8250 with __counted_by
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On 9/22/23 11:52, 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 pci1xxxx_8250.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>
> Cc: Tharun Kumar P <tharunkumar.pasumarthi@microchip.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Jiri Slaby <jirislaby@kernel.org>
> Cc: linux-serial@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks
--
Gustavo

> ---
> drivers/tty/serial/8250/8250_pci1xxxx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c
> index a3b25779d921..0da9847f3e91 100644
> --- a/drivers/tty/serial/8250/8250_pci1xxxx.c
> +++ b/drivers/tty/serial/8250/8250_pci1xxxx.c
> @@ -107,7 +107,7 @@ static const int logical_to_physical_port_idx[][MAX_PORTS] = {
> struct pci1xxxx_8250 {
> unsigned int nr;
> void __iomem *membase;
> - int line[];
> + int line[] __counted_by(nr);
> };
>
> static int pci1xxxx_get_num_ports(struct pci_dev *dev)

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