perf map: Fix dso->nsinfo refcounting
authorRiccardo Mancini <rickyman7@gmail.com>
Thu, 15 Jul 2021 16:07:06 +0000 (18:07 +0200)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 15 Jul 2021 20:25:27 +0000 (17:25 -0300)
commit2d6b74baa7147251c30a46c4996e8cc224aa2dc5
tree1d40cce8fcafb00f4c2ccf922112c838160d9163
parent0967ebffe098157180a0bbd180ac90348c6e07d7
perf map: 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: bf2e710b3cb8445c ("perf maps: Lookup maps in both intitial mountns and inner mountns.")
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>
tools/perf/util/map.c