[PATCH 1/2] perf tools: Initialize output buffer in build_id__sprintf

From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Ingo Molnar <mingo@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Michael Petlan <mpetlan@redhat.com>,
	Ian Rogers <irogers@google.com>,
	Stephane Eranian <eranian@google.com>
Subject: [PATCH 1/2] perf tools: Initialize output buffer in build_id__sprintf
Date: Mon,  2 Nov 2020 00:31:02 +0100	[thread overview]
Message-ID: <20201101233103.3537427-1-jolsa@kernel.org> (raw)

We display garbage for undefined build_id objects,
because we don't initialize the output buffer.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/build-id.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 8763772f1095..6b410c3d52dc 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -102,6 +102,8 @@ int build_id__sprintf(const struct build_id *build_id, char *bf)
 	const u8 *raw = build_id->data;
 	size_t i;
 
+	bf[0] = 0x0;
+
 	for (i = 0; i < build_id->size; ++i) {
 		sprintf(bid, "%02x", *raw);
 		++raw;
-- 
2.26.2

