perf record: Robustify perf_event__synth_time_conv()

It is possible that all events in an evlist are overwritable.
perf_event__synth_time_conv() should not crash in this case.
record__pick_pc() is used to check avaliability.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1464056944-166978-3-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
[ Split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 10 insertions, 1 deletions

diff --git a/tools/perf/arch/x86/util/tsc.c b/tools/perf/arch/x86/util/tsc.c
index 357f1b13b5ae..2e5567c94e09 100644
--- a/tools/perf/arch/x86/util/tsc.c
+++ b/tools/perf/arch/x86/util/tsc.c
@@ -62,6 +62,8 @@ int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
         struct perf_tsc_conversion tc;
         int err;
 
+        if (!pc)
+                return 0;
         err = perf_read_tsc_conversion(pc, &tc);
         if (err == -EOPNOTSUPP)
                 return 0;
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index dc3fcb597e4c..d4cf1b0c88f9 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -655,6 +655,13 @@ perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused
         return 0;
 }
 
+static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
+{
+        if (rec->evlist && rec->evlist->mmap && rec->evlist->mmap[0].base)
+                return rec->evlist->mmap[0].base;
+        return NULL;
+}
+
 static int record__synthesize(struct record *rec)
 {
         struct perf_session *session = rec->session;
@@ -692,7 +699,7 @@ static int record__synthesize(struct record *rec)
                 }
         }
 
-        err = perf_event__synth_time_conv(rec->evlist->mmap[0].base, tool,
+        err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
                                           process_synthesized_event, machine);
         if (err)
                 goto out;