[ Upstream commit ceb75476db1617a88cc29b09839acacb69aa076e ]
Based on the following report from Smatch, fix the potential NULL pointer dereference check.
tools/perf/ui/browsers/hists.c:641 hist_browser__run() error: we previously assumed 'hbt' could be null (see line 625)
tools/perf/ui/browsers/hists.c:3088 perf_evsel__hists_browse() error: we previously assumed 'browser->he_selection' could be null (see line 2902)
tools/perf/ui/browsers/hists.c:3272 perf_evsel_menu__run() error: we previously assumed 'hbt' could be null (see line 3260)
This patch firstly validating the pointers before access them, so can fix potential NULL pointer dereference.
Signed-off-by: Leo Yan leo.yan@linaro.org Acked-by: Jiri Olsa jolsa@kernel.org Cc: Adrian Hunter adrian.hunter@intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Andi Kleen ak@linux.intel.com Cc: Mathieu Poirier mathieu.poirier@linaro.org Cc: Namhyung Kim namhyung@kernel.org Cc: Suzuki Poulouse suzuki.poulose@arm.com Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20190708143937.7722-2-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/ui/browsers/hists.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c index a96f62ca984a..692d2fa31c35 100644 --- a/tools/perf/ui/browsers/hists.c +++ b/tools/perf/ui/browsers/hists.c @@ -633,7 +633,11 @@ int hist_browser__run(struct hist_browser *browser, const char *help, switch (key) { case K_TIMER: { u64 nr_entries; - hbt->timer(hbt->arg); + + WARN_ON_ONCE(!hbt); + + if (hbt) + hbt->timer(hbt->arg);
if (hist_browser__has_filter(browser) || symbol_conf.report_hierarchy) @@ -2707,7 +2711,7 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events, { struct hists *hists = evsel__hists(evsel); struct hist_browser *browser = perf_evsel_browser__new(evsel, hbt, env, annotation_opts); - struct branch_info *bi; + struct branch_info *bi = NULL; #define MAX_OPTIONS 16 char *options[MAX_OPTIONS]; struct popup_action actions[MAX_OPTIONS]; @@ -2973,7 +2977,9 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events, goto skip_annotation;
if (sort__mode == SORT_MODE__BRANCH) { - bi = browser->he_selection->branch_info; + + if (browser->he_selection) + bi = browser->he_selection->branch_info;
if (bi == NULL) goto skip_annotation; @@ -3144,7 +3150,8 @@ static int perf_evsel_menu__run(struct perf_evsel_menu *menu,
switch (key) { case K_TIMER: - hbt->timer(hbt->arg); + if (hbt) + hbt->timer(hbt->arg);
if (!menu->lost_events_warned && menu->lost_events &&