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author | Riccardo Mancini <rickyman7@gmail.com> | 2021-07-15 18:07:06 +0200 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-07-15 17:25:28 -0300 |
commit | dedeb4be203b382ba7245d13079bc3b0f6d40c65 (patch) | |
tree | 6f8d91544238d68bfeb03164f28199ba8640f718 /tools/perf | |
parent | 2d6b74baa7147251c30a46c4996e8cc224aa2dc5 (diff) | |
download | linux-dedeb4be203b382ba7245d13079bc3b0f6d40c65.tar.gz |
perf probe: Fix dso->nsinfo refcounting
ASan reports a memory leak of nsinfo during the execution of: # perf test "31: Lookup mmap thread". The leak is caused by a refcounted variable being replaced without dropping the refcount. This patch makes sure that the refcnt of nsinfo is decreased whenever a refcounted variable is replaced with a new value. Signed-off-by: Riccardo Mancini <rickyman7@gmail.com> Fixes: 544abd44c7064c8a ("perf probe: Allow placing uprobes in alternate namespaces.") Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Krister Johansen <kjlx@templeofstupid.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/55223bc8821b34ccb01f92ef1401c02b6a32e61f.1626343282.git.rickyman7@gmail.com [ Split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r-- | tools/perf/util/probe-event.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index c14e1d228e56..e05750cea34c 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -179,8 +179,10 @@ struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user) struct map *map; map = dso__new_map(target); - if (map && map->dso) + if (map && map->dso) { + nsinfo__put(map->dso->nsinfo); map->dso->nsinfo = nsinfo__get(nsi); + } return map; } else { return kernel_get_module_map(target); |