From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnaldo Carvalho de Melo Subject: [PATCH 32/91] libperf: Add NULL pointer check for cpu_map iteration and NULL assignment for all_cpus. Date: Wed, 6 May 2020 12:21:35 -0300 Message-ID: <20200506152234.21977-33-acme@kernel.org> References: <20200506152234.21977-1-acme@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20200506152234.21977-1-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, He Zhe , Andi Kleen , Kyle Meyer , Arnaldo Carvalho de Melo List-Id: linux-perf-users.vger.kernel.org From: He Zhe A NULL pointer may be passed to perf_cpu_map__cpu and then cause a crash, such as the one commit cb71f7d43ece ("libperf: Setup initial evlist::all_cpus value") fix. Signed-off-by: He Zhe Acked-by: Jiri Olsa Cc: Andi Kleen Cc: Kyle Meyer Link: http://lore.kernel.org/lkml/1583665157-349023-1-git-send-email-zhe.he@windriver.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/perf/cpumap.c | 2 +- tools/lib/perf/evlist.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/lib/perf/cpumap.c b/tools/lib/perf/cpumap.c index f93f4e703e4c..ca0215047c32 100644 --- a/tools/lib/perf/cpumap.c +++ b/tools/lib/perf/cpumap.c @@ -247,7 +247,7 @@ struct perf_cpu_map *perf_cpu_map__new(const char *cpu_list) int perf_cpu_map__cpu(const struct perf_cpu_map *cpus, int idx) { - if (idx < cpus->nr) + if (cpus && idx < cpus->nr) return cpus->map[idx]; return -1; diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c index def55054c55b..c481b62f2ce4 100644 --- a/tools/lib/perf/evlist.c +++ b/tools/lib/perf/evlist.c @@ -125,6 +125,7 @@ void perf_evlist__exit(struct perf_evlist *evlist) perf_cpu_map__put(evlist->cpus); perf_thread_map__put(evlist->threads); evlist->cpus = NULL; + evlist->all_cpus = NULL; evlist->threads = NULL; fdarray__exit(&evlist->pollfd); } -- 2.21.1