linux-kernel - [tip:perf/core] perf probe: Fix error reported when offset without function

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Date:	Thu, 27 Aug 2015 23:42:32 -0700
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	rostedt@...dmis.org, wangnan0@...wei.com, namhyung@...nel.org,
	hpa@...or.com, linux-kernel@...r.kernel.org, acme@...hat.com,
	mingo@...nel.org, masami.hiramatsu.pt@...achi.com,
	tglx@...utronix.de, lizefan@...wei.com
Subject: [tip:perf/core] perf probe:
  Fix error reported when offset without function

Commit-ID:  6c6e024f0a62a6a08c06002fd3caa2307cc54fd0
Gitweb:     http://git.kernel.org/tip/6c6e024f0a62a6a08c06002fd3caa2307cc54fd0
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Wed, 26 Aug 2015 10:57:44 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 26 Aug 2015 10:40:34 -0300

perf probe: Fix error reported when offset without function

This patch fixes a bug that, when offset is provided but function is
lost, parse_perf_probe_point() will give a "" string as function name,
so the checking code at the end of parse_perf_probe_point() become
useless.  For example:

  # perf probe +0x1234
  Failed to find symbol  in kernel
    Error: Failed to add events.

After this patch:

  # perf probe +0x1234
  Semantic error :Offset requires an entry function.
    Error: Command Parse Error.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1440586666-235233-6-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-event.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 926bcec..eaacb58 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1194,9 +1194,13 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 		*ptr++ = '\0';
 	}
 
-	tmp = strdup(arg);
-	if (tmp == NULL)
-		return -ENOMEM;
+	if (arg[0] == '\0')
+		tmp = NULL;
+	else {
+		tmp = strdup(arg);
+		if (tmp == NULL)
+			return -ENOMEM;
+	}
 
 	if (file_spec)
 		pp->file = tmp;
--
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