Re: [PATCH-for-5.1? v2] qapi/error: Check format string argument in error_*prepend()

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 7/24/20 10:03 AM, Markus Armbruster wrote:
> Philippe Mathieu-Daudé <philmd@redhat.com> writes:
> 
>> error_propagate_prepend() "behaves like error_prepend()", and
>> error_prepend() uses "formatting @fmt, ... like printf()".
>> error_prepend() checks its format string argument, but
>> error_propagate_prepend() does not. Fix by addint the format
> 
> s/addint/adding/
> 
>> attribute to error_propagate_prepend() and error_vprepend().
>>
>> This would have caught the bug fixed in the previous commit:
>>
>>     CC      hw/sd/milkymist-memcard.o
>>   hw/sd/milkymist-memcard.c: In function ‘milkymist_memcard_realize’:
>>   hw/sd/milkymist-memcard.c:284:70: error: format ‘%s’ expects a matching ‘char *’ argument [-Werror=format=]
>>     284 |         error_propagate_prepend(errp, err, "failed to init SD card: %s");
>>         |                                                                     ~^
>>         |                                                                      |
>>         |                                                                      char *
> 
> I see no need to repeat the details here.  If you agree, I'll drop them
> in my tree.

OK, thanks.

> 
>> Missed in commit 4b5766488f "error: Fix use of error_prepend() with
>> &error_fatal, &error_abort".
>>
>> Inspired-by: Stefan Weil <sw@weilnetz.de>
>> Suggested-by: Eric Blake <eblake@redhat.com>
>> Reviewed-by: Markus Armbruster <armbru@redhat.com>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> 
> Reviewed-by: Markus Armbruster <armbru@redhat.com>
>