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

Author: ahunter6

tools/perf/util/dlfilter.c

@@ -187,6 +187,8 @@ static __s32 dlfilter__resolve_address(void *ctx, __u64 address, struct perf_dlf
 
 	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;
 }