linux-kernel - [PATCH] perf jevents: Fix suspicious code in fixregex()

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Message-Id: <20200903152510.489233-1-namhyung@kernel.org>
Date:   Fri,  4 Sep 2020 00:25:10 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <andi@...stfloor.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH] perf jevents: Fix suspicious code in fixregex()

The new string should have enough space for the original string and
the back slashes IMHO.

Cc: John Garry <john.garry@...wei.com>
Cc: Kajol Jain <kjain@...ux.ibm.com>
Cc: Ian Rogers <irogers@...gle.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/pmu-events/jevents.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index fa86c5f997cc..fc9c158bfa13 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -137,7 +137,7 @@ static char *fixregex(char *s)
 		return s;
 
 	/* allocate space for a new string */
-	fixed = (char *) malloc(len + 1);
+	fixed = (char *) malloc(len + esc_count + 1);
 	if (!fixed)
 		return NULL;
 
-- 
2.28.0.402.g5ffc5be6b7-goog