Re: [PATCH-for-5.2 v2] hw/intc: fix heap-buffer-overflow in rxicu_realize()

[Peter Maydell <peter.maydell@linaro.org>]

On Wed, 11 Nov 2020 at 14:18, Chen Qun <kuhn.chenqun@huawei.com> wrote:
>
> When 'j = icu->nr_sense – 1', the 'j < icu->nr_sense' condition is true,
> then 'j = icu->nr_sense', the'icu->init_sense[j]' has out-of-bounds access.
>
> The asan showed stack:
> ERROR: AddressSanitizer: heap-buffer-overflow on address 0x604000004d7d at pc 0x55852cd26a76 bp 0x7ffe39f26200 sp 0x7ffe39f261f0
> READ of size 1 at 0x604000004d7d thread T0
>     #0 0x55852cd26a75 in rxicu_realize ../hw/intc/rx_icu.c:311
>     #1 0x55852cf075f7 in device_set_realized ../hw/core/qdev.c:886
>     #2 0x55852cd4a32f in property_set_bool ../qom/object.c:2251
>     #3 0x55852cd4f9bb in object_property_set ../qom/object.c:1398
>     #4 0x55852cd54f3f in object_property_set_qobject ../qom/qom-qobject.c:28
>     #5 0x55852cd4fc3f in object_property_set_bool ../qom/object.c:1465
>     #6 0x55852cbf0b27 in register_icu ../hw/rx/rx62n.c:156
>     #7 0x55852cbf12a6 in rx62n_realize ../hw/rx/rx62n.c:261
>     #8 0x55852cf075f7 in device_set_realized ../hw/core/qdev.c:886
>     #9 0x55852cd4a32f in property_set_bool ../qom/object.c:2251
>     #10 0x55852cd4f9bb in object_property_set ../qom/object.c:1398
>     #11 0x55852cd54f3f in object_property_set_qobject ../qom/qom-qobject.c:28
>     #12 0x55852cd4fc3f in object_property_set_bool ../qom/object.c:1465
>     #13 0x55852cbf1a85 in rx_gdbsim_init ../hw/rx/rx-gdbsim.c:109
>     #14 0x55852cd22de0 in qemu_init ../softmmu/vl.c:4380
>     #15 0x55852ca57088 in main ../softmmu/main.c:49
>     #16 0x7feefafa5d42 in __libc_start_main (/lib64/libc.so.6+0x26d42)
>
> Add the 'ice->src[i].sense' initialize to the default value, and then
> process init_sense array to identify which irqs should be level-triggered.
>
> Suggested-by: Peter Maydell <peter.maydell@linaro.org>
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>


Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM