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migration: Plug memory leak
'channel' and 'addr' in qmp_migrate() are not auto-freed.
migrate_uri_parse() allocates memory which is returned to 'channel',
which is leaked because there is no code for freeing 'channel' or
'addr'. So, free addr and channel to avoid memory leak. 'addr'
does shallow copying of channel->addr, hence free 'channel' itself
and deep free contents of 'addr'.
Het Gala <het.g...@nutanix.com> writes:
> Fixes: 5994024f ("migration: Implement MigrateChannelList to qmp
> migration flow")
> Signed-off-by: Het Gala <het.g...@nutanix.com>
> ---
> migration/migration.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/migration/migration.c b/migration/migration.c
> index 28a34c9068..29efb51b62 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -2004,6 +2004,8 @@ void qmp_migrate(const char *uri, bool has_channels,
> MIGRATION_STATUS_FAILED);
> block_cleanup_parameters();
> }
> + g_free(channel);
> + qapi_free_MigrationAddress(addr);
>
> if (local_err) {
> if (!resume_requested) {
What makes you think there's a memory leak? I can't see it.
qmp_migrate() has two callers:
1. qmp_marshal_migrate(), in generated qapi-commands-migration.c
qmp_marshal_migrate() deserializes @args into @arg with a visitor.
This allocates @arg and its members, including arg.channels. It
passes all the members of @arg to qmp_migrate(). And then it frees
@arg and its members including arg.channels.
2. hmp_migrate()
hmp_migrate() allocates @channel with migrate_uri_parse(), adds it to
list @caps, passes @caps to qmp_migrate(), then frees @caps with
qapi_free_MigrationChannelList().
