linux-kernel - [PATCH v2 06/18] perf buildid-cache: Fix use of uninitialized value

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Message-Id: <20231005230851.3666908-7-irogers@google.com>
Date:   Thu,  5 Oct 2023 16:08:39 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ming Wang <wangming01@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Yuan Can <yuancan@...wei.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        James Clark <james.clark@....com>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH v2 06/18] perf buildid-cache: Fix use of uninitialized value

The buildid filename is first determined and then from this the
buildid read. If getting the filename fails then the buildid will be
used for a later memcmp uninitialized. Detected by clang-tidy.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-buildid-cache.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index cd381693658b..e2a40f1d9225 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -277,8 +277,10 @@ static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
 	char filename[PATH_MAX];
 	struct build_id bid;
 
-	if (dso__build_id_filename(dso, filename, sizeof(filename), false) &&
-	    filename__read_build_id(filename, &bid) == -1) {
+	if (!dso__build_id_filename(dso, filename, sizeof(filename), false))
+		return true;
+
+	if (filename__read_build_id(filename, &bid) == -1) {
 		if (errno == ENOENT)
 			return false;
 
-- 
2.42.0.609.gbb76f46606-goog