linux-kernel - [tip:perf/core] perf header: Fail on write

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Message-ID: <tip-2ff5365d75e164032f64133914046fd6be213d94@git.kernel.org>
Date:   Thu, 20 Jul 2017 01:59:07 -0700
From:   tip-bot for David Carrillo-Cisneros <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     ak@...ux.intel.com, alexander.shishkin@...ux.intel.com,
        sque@...omium.org, mhiramat@...nel.org, peterz@...radead.org,
        davidcc@...gle.com, acme@...hat.com, mingo@...nel.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        dsahern@...il.com, pjt@...gle.com, eranian@...gle.com,
        namhyung@...nel.org, hekuang@...wei.com, hpa@...or.com,
        wangnan0@...wei.com, jolsa@...nel.org
Subject: [tip:perf/core] perf header: Fail on write_padded error

Commit-ID:  2ff5365d75e164032f64133914046fd6be213d94
Gitweb:     http://git.kernel.org/tip/2ff5365d75e164032f64133914046fd6be213d94
Author:     David Carrillo-Cisneros <davidcc@...gle.com>
AuthorDate: Mon, 17 Jul 2017 21:25:36 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 18 Jul 2017 23:14:29 -0300

perf header: Fail on write_padded error

Do not proceed if write_padded() error failed.

Also, add comments to remind that the return value of write_* functions
in util/header.c is an errno code and not the number of bytes written.

Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
Acked-by: David Ahern <dsahern@...il.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...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>
Link: http://lkml.kernel.org/r/20170718042549.145161-4-davidcc@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/header.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 3b833f0..8dda19b 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -74,6 +74,7 @@ bool perf_header__has_feat(const struct perf_header *header, int feat)
 	return test_bit(feat, header->adds_features);
 }
 
+/* Return: 0 if succeded, -ERR if failed. */
 static int do_write(int fd, const void *buf, size_t size)
 {
 	while (size) {
@@ -89,6 +90,7 @@ static int do_write(int fd, const void *buf, size_t size)
 	return 0;
 }
 
+/* Return: 0 if succeded, -ERR if failed. */
 int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
 {
 	static const char zero_buf[NAME_ALIGN];
@@ -103,6 +105,7 @@ int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
 #define string_size(str)						\
 	(PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
 
+/* Return: 0 if succeded, -ERR if failed. */
 static int do_write_string(int fd, const char *str)
 {
 	u32 len, olen;
@@ -3200,7 +3203,8 @@ int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
 	 */
 	tracing_data_put(tdata);
 
-	write_padded(fd, NULL, 0, padding);
+	if (write_padded(fd, NULL, 0, padding))
+		return -1;
 
 	return aligned_size;
 }