Re: [Qemu-block] [PATCH] block/vdi: Don't take address of fields in packed structs

[Peter Maydell]

On 17 October 2018 at 15:55, Kevin Wolf <address@hidden> wrote:
> Am 16.10.2018 um 19:25 hat Peter Maydell geschrieben:
>> Taking the address of a field in a packed struct is a bad idea, because
>> it might not be actually aligned enough for that pointer type (and
>> thus cause a crash on dereference on some host architectures). Newer
>> versions of clang warn about this. Avoid the bug by not using the
>> "modify in place" byte swapping functions.
>>
>> There are a few places where the in-place swap function is
>> used on something other than a packed struct field; we convert
>> those anyway, for consistency.
>>
>> Patch produced with scripts/coccinelle/inplace-byteswaps.cocci.
>>
>> There are other places where we take the address of a packed member
>> in this file for other purposes than passing it to a byteswap
>> function (all the calls to qemu_uuid_*()); we leave those for now.
>>
>> Signed-off-by: Peter Maydell <address@hidden>
>
> Thanks, applied to the block branch.

This also hasn't made it into master.

thanks
-- PMM