Re: [PATCH] hw/net/can: sja1000 fix buff2frame_bas for dlc out of std CAN 8 bytes

[Pavel Pisa]

Hello everybody,

please, can somebody accept the fix for master?
It should be ideally applied even to stable
branches.

Or should I send request through some other form
then on the list?

Thanks,

Pavel

On Monday 26 of July 2021 18:24:58 Pavel Pisa wrote:
> Problem reported by openEuler fuzz-sig group.
>
> The buff2frame_bas function (hw\net\can\can_sja1000.c)
> infoleak(qemu5.x~qemu6.x) or stack-overflow(qemu 4.x).
>
> Reported-by: Qiang Ning <ningqiang1@huawei.com>
> Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
> ---
>  hw/net/can/can_sja1000.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/hw/net/can/can_sja1000.c b/hw/net/can/can_sja1000.c
> index 42d2f99dfb..64e81bff58 100644
> --- a/hw/net/can/can_sja1000.c
> +++ b/hw/net/can/can_sja1000.c
> @@ -311,6 +311,10 @@ static void buff2frame_bas(const uint8_t *buff,
> qemu_can_frame *frame) }
>      frame->can_dlc = buff[1] & 0x0f;
>
> +    if (frame->can_dlc > 8) {
> +        frame->can_dlc = 8;
> +    }
> +
>      for (i = 0; i < frame->can_dlc; i++) {
>          frame->data[i] = buff[2 + i];
>      }

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