linux-kernel - [PATCH] perf stat: Potential NULL dereference in print

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Date:   Sat, 13 Oct 2018 13:19:40 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] perf stat: Potential NULL dereference in print_aggr()

Smatch complains that:

    ./tools/perf/util/stat-display.c:616 print_aggr()
    error: we previously assumed 'config->aggr_map' could be null (see line 607)

Not only that, but it looks like aggr_update_shadow() can Oops if
"config->aggr_get_id" is NULL.  The intent seems to have been to return
if either of these pointers is NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 tools/perf/util/stat-display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index e7b4c44ebb62..db635c01d3a3 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -604,7 +604,7 @@ static void print_aggr(struct perf_stat_config *config,
 	u64 ena, run, val;
 	bool first;
 
-	if (!(config->aggr_map || config->aggr_get_id))
+	if (!config->aggr_map || !config->aggr_get_id)
 		return;
 
 	aggr_update_shadow(config, evlist);
-- 
2.18.0