linux-kernel - [PATCH] perf session: check for null pointer before derefernce

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Date:   Mon, 24 Jan 2022 20:00:01 +0500
From:   Ameer Hamza <amhamza.mgc@...il.com>
To:     mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        rickyman7@...il.com, alexey.v.bayduraev@...ux.intel.com,
        adrian.hunter@...el.com, leo.yan@...aro.org, german.gomez@....com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        amhamza.mgc@...il.com
Subject: [PATCH] perf session: check for null pointer before derefernce

Move null pointer check before dereferncing the variable

Addresses-Coverity: 1497622 ("Derereference before null check")

Signed-off-by: Ameer Hamza <amhamza.mgc@...il.com>
---
 tools/perf/util/session.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index f19348dddd55..e1014ab62c10 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1503,11 +1503,11 @@ static int machines__deliver_event(struct machines *machines,
 			++evlist->stats.nr_unknown_id;
 			return 0;
 		}
-		dump_sample(evsel, event, sample, perf_env__arch(machine->env));
 		if (machine == NULL) {
 			++evlist->stats.nr_unprocessable_samples;
 			return 0;
 		}
+		dump_sample(evsel, event, sample, perf_env__arch(machine->env));
 		return evlist__deliver_sample(evlist, tool, event, sample, evsel, machine);
 	case PERF_RECORD_MMAP:
 		return tool->mmap(tool, event, sample, machine);
-- 
2.25.1