perf stat: Fix NULL pointer dereference

If config->aggr_map is NULL and config->aggr_get_id is not NULL,
the function print_aggr() will still calling arrg_update_shadow(),
which can result in accessing the invalid pointer.

Fixes: 088519f318be ("perf stat: Move the display functions to stat-display.c")
Signed-off-by: Hongbo Yao <yaohongbo@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wei Li <liwei391@huawei.com>
Link: https://lore.kernel.org/lkml/20200608163625.GC3073@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 3c6976f..57d0706 100644 (file)
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -668,7 +668,7 @@ static void print_aggr(struct perf_stat_config *config,
        int s;
        bool first;
 
-       if (!(config->aggr_map || config->aggr_get_id))
+       if (!config->aggr_map || !config->aggr_get_id)
                return;
 
        aggr_update_shadow(config, evlist);
@@ -1169,7 +1169,7 @@ static void print_percore(struct perf_stat_config *config,
        int s;
        bool first = true;
 
-       if (!(config->aggr_map || config->aggr_get_id))
+       if (!config->aggr_map || !config->aggr_get_id)
                return;
 
        if (config->percore_show_thread)