linux-kernel - [PATCH 3.16 040/134] perf inject: Don't proceed if perf_session__process

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Message-ID: <lsq.1503062000.916566276@decadent.org.uk>
Date:   Fri, 18 Aug 2017 14:13:20 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "David Carrillo-Cisneros" <davidcc@...gle.com>,
        "Masami Hiramatsu" <mhiramat@...nel.org>,
        "Andrew Vagin" <avagin@...nvz.org>,
        "Arnaldo Carvalho de Melo" <acme@...hat.com>,
        "Andi Kleen" <ak@...ux.intel.com>,
        "Wang Nan" <wangnan0@...wei.com>,
        "Stephane Eranian" <eranian@...gle.com>,
        "Paul Turner" <pjt@...gle.com>,
        "Alexander Shishkin" <alexander.shishkin@...ux.intel.com>,
        "Simon Que" <sque@...omium.org>, "Jiri Olsa" <jolsa@...nel.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "He Kuang" <hekuang@...wei.com>
Subject: [PATCH 3.16 040/134] perf inject: Don't proceed if
 perf_session__process_event() fails

3.16.47-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: David Carrillo-Cisneros <davidcc@...gle.com>

commit bb8d521f77f3e68a713456b7fb1e99f52ff3342c 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 e558a5bd8b ("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@...gle.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Andrew Vagin <avagin@...nvz.org>
Cc: He Kuang <hekuang@...wei.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Simon Que <sque@...omium.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Wang Nan <wangnan0@...wei.com>
Fixes: e558a5bd8b74 ("perf inject: Work with files")
Link: http://lkml.kernel.org/r/20170410201432.24807-2-davidcc@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 tools/perf/builtin-inject.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -387,6 +387,8 @@ static int __cmd_inject(struct perf_inje
 		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;