From: Cengiz Can cengiz@kernel.wtf
commit 85fc95d75970ee7dd8e01904e7fb1197c275ba6b upstream.
`tools/perf/util/map.c` has a function named `maps__insert` that acquires a write lock if its in multithread context.
Even though this lock is released when function successfully completes, there's a branch that is executed when `maps_by_name == NULL` that returns from this function without releasing the write lock.
Added an `up_write` to release the lock when this happens.
Fixes: a7c2b572e217 ("perf map_groups: Auto sort maps by name, if needed") Signed-off-by: Cengiz Can cengiz@kernel.wtf Cc: Adrian Hunter adrian.hunter@intel.com Cc: Jiri Olsa jolsa@kernel.org Cc: Namhyung Kim namhyung@kernel.org Link: http://lore.kernel.org/lkml/20200120141553.23934-1-cengiz@kernel.wtf Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/perf/util/map.c | 1 + 1 file changed, 1 insertion(+)
--- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -549,6 +549,7 @@ void maps__insert(struct maps *maps, str
if (maps_by_name == NULL) { __maps__free_maps_by_name(maps); + up_write(&maps->lock); return; }