Re: [Qemu-devel] [PATCH v2 1/1] qemu/migration: fix the double free problem on from_src_file

[QingFeng Hao]

在 2017/6/7 20:18, Dr. David Alan Gilbert 写道:
> * QingFeng Hao (address@hidden) wrote:
> > 在 2017/6/6 20:49, Kevin Wolf 写道:
> > > Am 06.06.2017 um 07:24 hat QingFeng Hao geschrieben:
> <snip>
>
> > > I can't tell for postcopy_ram_listen_thread() - commit 660819b didn't
> > > seem to remove a qemu_fclose() call there, but I can't see one left
> > > behind either. Was the file leaked before commit 660819b or am I
> > > missing something?
> > I don't think so because loadvm_postcopy_handle_listen creates thread
> > postcopy_ram_listen_thread
> > and passes mis->from_src_file as its arg, which will be closed by
> > migration_incoming_state_destroy.
> > What confuses me is in the series function calls of qemu_loadvm_state_main
> > etc, argument f looks
> > to be redundant as mis already contains from_src_file which equals to f.
> In postcopy qemu_loadvm_state_main is called with two different file
> arguments but the same mis argument;  see loadvm_handle_cmd_packaged for
> the other case where it's called on a packaged-file blob.
yes, you are right, I missed that one. :)
> > Furthermore, mis may be
> > also redundant as it can be got via migration_incoming_get_current. Thanks!
> We keep changing our minds about the preferred style.  Sometimes we
> think it's best to pass the pointer, sometimes we think it's best
> to call get_current.
Got it. Thanks!
> Dave
>
> > > Kevin
> > --
> > Regards
> > QingFeng Hao
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK

--
Regards
QingFeng Hao