[PATCH] Fix misaligned access accessing HEADER struct in res_query.c

[Florian Weimer]

On 06/15/2016 04:40 PM, John David Anglin wrote:
> On 2016-06-15 8:16 AM, Andreas Schwab wrote:
>> Florian Weimer<fweimer@redhat.com>  writes:
>>
>>> >On 06/15/2016 01:42 PM, John David Anglin wrote:
>>>> >>The attached patch fixes BZ 20243.  The HEADER struct needs to be
>>>> packed so that
>>>> >>byte accesses are used.  Tested using glibc 2.22-11on hppa.
>>>> Please install if okay.
>>> >
>>>> >>-} HEADER;
>>>> >>+} __attribute__ ((packed)) HEADER;


> I don't think the packed derivative affects the layout of HEADER given
> the way the fields are
> arranged.

I verified that it changes alignment, even on x86_64.  That's the 
intent, and it results in a layout change (if this struct is used as a 
part of other structs, for example).

Florian