linux-kernel - [PATCH v3 4/6] perf probe: Fix error reported when offset without function

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Date:	Wed, 26 Aug 2015 10:57:44 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...nel.org>, <masami.hiramatsu.pt@...achi.com>,
	<rostedt@...dmis.org>
CC:	<mingo@...hat.com>, <namhyung@...nel.org>, <pi3orama@....com>,
	<lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: [PATCH v3 4/6] 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>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 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;
-- 
1.8.3.4

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