linux-kernel - [ 073/103] uprobes: Fix return value in error handling path

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Message-Id: <20130723220427.764210050@linuxfoundation.org>
Date:	Tue, 23 Jul 2013 15:26:24 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	srikar@...ux.vnet.ibm.com, Steven Rostedt <rostedt@...dmis.org>
Subject: [ 073/103] uprobes: Fix return value in error handling path

3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: "zhangwei(Jovi)" <jovi.zhangwei@...wei.com>

commit fa44063f9ef163c3a4c8d8c0465bb8a056b42035 upstream.

When wrong argument is passed into uprobe_events it does not return
an error:

[root@...i tracing]# echo 'p:myprobe /bin/bash' > uprobe_events
[root@...i tracing]#

The proper response is:

[root@...i tracing]# echo 'p:myprobe /bin/bash' > uprobe_events
-bash: echo: write error: Invalid argument

Link: http://lkml.kernel.org/r/51B964FF.5000106@huawei.com

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: <srikar@...ux.vnet.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/trace/trace_uprobe.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -283,8 +283,10 @@ static int create_trace_uprobe(int argc,
 		return -EINVAL;
 	}
 	arg = strchr(argv[1], ':');
-	if (!arg)
+	if (!arg) {
+		ret = -EINVAL;
 		goto fail_address_parse;
+	}
 
 	*arg++ = '\0';
 	filename = argv[1];


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