perf dlfilter: Avoid leak in v0 API test use of resolve_address()

The introduction of reference counting causes the v0 API
perf_dlfilter_fns.resolve_address() to leak.

v2 API introduced perf_dlfilter_fns.al_cleanup() to prevent that.

For the v0 API, avoid the leak by exiting the addr_location immediately,
since the documentation makes it clear that pointers obtained via
perf_dlfilter_fns are not necessarily valid (dereferenceable) after
'filter_event' and 'filter_event_early' return.

Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Adrian Hunter <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Closes: https://lore.kernel.org/oe-lkp/[e-mail]
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/dlfilter.c

···
 
 	if (has_priv(d_al_p))
 		d_al_p->priv = memdup(&al, sizeof(al));
+	else /* Avoid leak for v0 API */
+		addr_location__exit(&al);
 
 	return 0;
 }