linux-kernel - [PATCH v4 01/22] perf symbol: Avoid memory leak from abi::__cxa

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Date:   Sun, 19 Mar 2023 20:37:49 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        "André Almeida" <andrealmeid@...labora.com>,
        James Clark <james.clark@....com>,
        John Garry <john.g.garry@...cle.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Shunsuke Nakamura <nakamura.shun@...itsu.com>,
        Song Liu <song@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Miaoqian Lin <linmq006@...il.com>,
        Stephen Brennan <stephen.s.brennan@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, Hao Luo <haoluo@...gle.com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v4 01/22] perf symbol: Avoid memory leak from abi::__cxa_demangle

Rather than allocate memory, allow abi::__cxa_demangle to do
that. This avoids a problem where on error NULL was returned
triggering a memory leak.

Fixes: 3b4e4efe88f6 ("perf symbol: Add abi::__cxa_demangle C++ demangling support")
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/demangle-cxx.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/demangle-cxx.cpp b/tools/perf/util/demangle-cxx.cpp
index 8708bcafd370..85b706641837 100644
--- a/tools/perf/util/demangle-cxx.cpp
+++ b/tools/perf/util/demangle-cxx.cpp
@@ -38,11 +38,10 @@ char *cxx_demangle_sym(const char *str, bool params __maybe_unused,
 
         return cplus_demangle(str, flags);
 #elif defined(HAVE_CXA_DEMANGLE_SUPPORT)
-        size_t len = strlen(str);
-        char *output = (char*)malloc(len);
+        char *output;
         int status;
 
-        output = abi::__cxa_demangle(str, output, &len, &status);
+        output = abi::__cxa_demangle(str, /*output_buffer=*/NULL, /*length=*/NULL, &status);
         return output;
 #else
         return NULL;
-- 
2.40.0.rc1.284.g88254d51c5-goog