tracing/probe: Check maxactive error cases

Check maxactive on kprobe error case, because maxactive
is only for kretprobe, not for kprobe. Also, maxactive
should not be 0, it should be at least 1.

Link: http://lkml.kernel.org/r/155253780952.14922.15784129810238750331.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 7 insertions, 3 deletions

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index ceafa0a2b1d1..a14837545295 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -624,7 +624,11 @@ static int trace_kprobe_create(int argc, const char *argv[])
         if (event)
                 event++;
 
-        if (is_return && isdigit(argv[0][1])) {
+        if (isdigit(argv[0][1])) {
+                if (!is_return) {
+                        pr_info("Maxactive is not for kprobe");
+                        return -EINVAL;
+                }
                 if (event)
                         len = event - &argv[0][1] - 1;
                 else
@@ -634,8 +638,8 @@ static int trace_kprobe_create(int argc, const char *argv[])
                 memcpy(buf, &argv[0][1], len);
                 buf[len] = '\0';
                 ret = kstrtouint(buf, 0, &maxactive);
-                if (ret) {
-                        pr_info("Failed to parse maxactive.\n");
+                if (ret || !maxactive) {
+                        pr_info("Invalid maxactive number\n");
                         return ret;
                 }
                 /* kretprobes instances are iterated over via a list. The