From 45210e1ada6d7889e573e993b66ed0e958aaa8ec Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 30 Aug 2023 12:05:39 +0300 Subject: [PATCH] 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 Signed-off-by: Adrian Hunter Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Closes: https://lore.kernel.org/oe-lkp/202308232146.94d82cb4-oliver.sang@intel.com Link: http://lore.kernel.org/lkml/20230830090539.68206-1-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/dlfilter.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/perf/util/dlfilter.c b/tools/perf/util/dlfilter.c index e0f822ebb9b9..1dbf27822ee2 100644 --- a/tools/perf/util/dlfilter.c +++ b/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; }