Re: [Qemu-devel] [Qemu-devel PATCH v2 2/2] util/main-loop: Fix incorrect assertion

[Lidong Chen <lidong.chen@oracle.com>]

On 6/5/2019 1:57 AM, Philippe Mathieu-Daudé wrote:
> This patch doesn't seem related to the series cover.
I will resent the patch to include more details to the cover.
>
> On 6/5/19 8:21 AM, Lidong Chen wrote:
>> The check for poll_fds in g_assert() was incorrect. The correct assertion
>> should check "n_poll_fds + w->num <= ARRAY_SIZE(poll_fds)" because the
>> subsequent for-loop is doing access to poll_fds[n_poll_fds + i] where i
>> is in [0, w->num).
>>
> Suggested-by: Peter Maydell <peter.maydell@linaro.org>

Liam Merwick also suggested this fix. So, added him as well.

Thanks,

Lidong

>
>> Signed-off-by: Lidong Chen <lidong.chen@oracle.com>
>> Reviewed-by: Liran Alon <liran.alon@oracle.com>
>> Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>
>> ---
>>   util/main-loop.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/util/main-loop.c b/util/main-loop.c
>> index e1e349c..a9f4e8d 100644
>> --- a/util/main-loop.c
>> +++ b/util/main-loop.c
>> @@ -422,7 +422,7 @@ static int os_host_main_loop_wait(int64_t timeout)
>>       g_main_context_prepare(context, &max_priority);
>>       n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
>>                                         poll_fds, ARRAY_SIZE(poll_fds));
>> -    g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));
>> +    g_assert(n_poll_fds + w->num <= ARRAY_SIZE(poll_fds));
>>   
>>       for (i = 0; i < w->num; i++) {
>>           poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i];
>>