linux-kernel - [PATCH] perf bpf: Fix lock/unlock imbalance in perf_env__find

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Message-ID: <20190422151056.GA24665@embeddedor>
Date:   Mon, 22 Apr 2019 10:10:56 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        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>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] perf bpf: Fix lock/unlock imbalance in perf_env__find_btf()
 info

Fix lock/unlock imbalance by moving the call to up_read() just after
the *out* label.

Addresses-Coverity-ID: 1444762 ("Missing unlock")
Fixes: 2db7b1e0bd49 ("perf bpf: Return NULL when RB tree lookup fails in perf_env__find_btf()")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 tools/perf/util/env.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 9494f9dc61ec..6a3eaf7d9353 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -115,8 +115,8 @@ struct btf_node *perf_env__find_btf(struct perf_env *env, __u32 btf_id)
 	}
 	node = NULL;
 
-	up_read(&env->bpf_progs.lock);
 out:
+	up_read(&env->bpf_progs.lock);
 	return node;
 }
 
-- 
2.21.0