perf inject: Don't proceed if perf_session__process_event() fails

commit bb8d521f upstream.

All paths following perf_session__process_event() in __cmd_inject() are
useless if __cmd_inject() is to fail, some depend on a correct
session->evlist.

First commit to add code that depends on session->evlist without checking
error was commmit e558a5bd ("perf inject: Work with files"). It has
grown since then.

Change __cmd_inject() to fail immediately after
perf_session__process_event() fails.
Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Que <sque@chromium.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: e558a5bd ("perf inject: Work with files")
Link: http://lkml.kernel.org/r/20170410201432.24807-2-davidcc@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

tools/perf/builtin-inject.c

@@ -387,6 +387,8 @@ static int __cmd_inject(struct perf_inject *inject)
 		lseek(file_out->fd, session->header.data_offset, SEEK_SET);
 
 	ret = perf_session__process_events(session, &inject->tool);
+	if (ret)
+		return ret;
 
 	if (!file_out->is_pipe) {
 		session->header.data_size = inject->bytes_written;