ksym_tracer: Fix validation of length of access type

Don't take newline into account, otherwise:

 # echo 'pid_max:-w-' > ksym_trace_filter
 # echo -n 'pid_max:rw-' > ksym_trace_filter
 bash: echo: write error: Invalid argument

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: "K.Prasad" <prasad@linux.vnet.ibm.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4A52E2EB.9070503@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/trace_ksym.c

@@ -158,21 +158,21 @@ static int ksym_trace_get_access_type(char *str)
 static int parse_ksym_trace_str(char *input_string, char **ksymname,
 							unsigned long *addr)
 {
-	char *delimiter = ":";
 	int ret;
 
-	ret = -EINVAL;
-	*ksymname = strsep(&input_string, delimiter);
+	strstrip(input_string);
+
+	*ksymname = strsep(&input_string, ":");
 	*addr = kallsyms_lookup_name(*ksymname);
 
 	/* Check for malformed request: (2), (1) and (5) */
 	if ((!input_string) ||
-		(strlen(input_string) != (KSYM_TRACER_OP_LEN + 1)) ||
-			(*addr == 0))
-		goto return_code;
+	    (strlen(input_string) != KSYM_TRACER_OP_LEN) ||
+	    (*addr == 0))
+		return -EINVAL;;
+
 	ret = ksym_trace_get_access_type(input_string);
 
-return_code:
 	return ret;
 }