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Subject[PATCH 005/106] uprobes: Fix return value in error handling path
Date
3.5.7.18 -stable review patch.  If anyone has any objections, please let me know.

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

From: "zhangwei(Jovi)" <jovi.zhangwei@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.5000106@huawei.com

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: <srikar@linux.vnet.ibm.com>
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Luis Henriques <luis.henriques@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 2b36ac6..5c83613 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -243,8 +243,10 @@ 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];
--
1.8.3.2


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