perf tools: Fix error path to do closedir() when synthesizing threads

When traversing /proc to synthesize the PERF_RECORD_FORK et al events we
were bailing out on errors without calling closedir(), fix it.

Reported-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-vxtp593rfztgbi8noy0m967p@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 9 insertions, 8 deletions

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 9d0985131252..ff866c4d2e2f 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -387,6 +387,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
         DIR *tasks;
         struct dirent dirent, *next;
         pid_t tgid, ppid;
+        int rc = 0;
 
         /* special case: only send one comm event using passed in pid */
         if (!full) {
@@ -414,38 +415,38 @@ static int __event__synthesize_thread(union perf_event *comm_event,
 
         while (!readdir_r(tasks, &dirent, &next) && next) {
                 char *end;
-                int rc = 0;
                 pid_t _pid;
 
                 _pid = strtol(dirent.d_name, &end, 10);
                 if (*end)
                         continue;
 
+                rc = -1;
                 if (perf_event__prepare_comm(comm_event, _pid, machine,
                                              &tgid, &ppid) != 0)
-                        return -1;
+                        break;
 
                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
                                                 ppid, process, machine) < 0)
-                        return -1;
+                        break;
                 /*
                  * Send the prepared comm event
                  */
                 if (process(tool, comm_event, &synth_sample, machine) != 0)
-                        return -1;
+                        break;
 
+                rc = 0;
                 if (_pid == pid) {
                         /* process the parent's maps too */
                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
                                                 process, machine, mmap_data);
+                        if (rc)
+                                break;
                 }
-
-                if (rc)
-                        return rc;
         }
 
         closedir(tasks);
-        return 0;
+        return rc;
 }
 
 int perf_event__synthesize_thread_map(struct perf_tool *tool,