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

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

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

commit fa44063f9ef163c3a4c8d8c0465bb8a056b42035 upstream.

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

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

The proper response is:

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

Link: http://lkml.kernel.org/r/51b964ff.5000...@huawei.com

Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: <sri...@linux.vnet.ibm.com>
Signed-off-by: zhangwei(Jovi) <jovi.zhang...@huawei.com>
Signed-off-by: Steven Rostedt <rost...@goodmis.org>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
 kernel/trace/trace_uprobe.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index c86e6d4..c3946f9 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -244,8 +244,10 @@ static int create_trace_uprobe(int argc, char **argv)
                return -EINVAL;
        }
        arg = strchr(argv[1], ':');
-       if (!arg)
+       if (!arg) {
+               ret = -EINVAL;
                goto fail_address_parse;
+       }
 
        *arg++ = '\0';
        filename = argv[1];
-- 
1.8.1.2

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