Messages in this thread Patch in this message | | | Date | Thu, 15 Jul 2021 16:44:12 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH 01/20] perf nsinfo: fix refcounting |
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Em Thu, Jul 15, 2021 at 04:02:16PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Thu, Jul 15, 2021 at 06:07:06PM +0200, Riccardo Mancini escreveu: > > ASan reports a memory leak of nsinfo during the execution of the 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. > > So, there are multiple fixes in just one patch, I'll split it into > three, no need to resend. > > I'll try and check if finding Fixes: for the three is easy, that way > stable@vger.kernel.org will figure out which of the supported releases > need each of them.
3rd:
commit 7416120498f83963f4c5662847a1a0556e771b89 Author: Riccardo Mancini <rickyman7@gmail.com> Date: Thu Jul 15 18:07:06 2021 +0200
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>
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index c14e1d228e56b1c6..e05750cea34c3a95 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);
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