diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c
index 3b21f40..881f90f 100644
--- a/kernel/trace/fprobe.c
+++ b/kernel/trace/fprobe.c
@@ -189,7 +189,7 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
 {
 	int i, size;
 
-	if (num < 0)
+	if (num <= 0)
 		return -EINVAL;
 
 	if (!fp->exit_handler) {
@@ -202,8 +202,8 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
 		size = fp->nr_maxactive;
 	else
 		size = num * num_possible_cpus() * 2;
-	if (size < 0)
-		return -E2BIG;
+	if (size <= 0)
+		return -EINVAL;
 
 	fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler);
 	if (!fp->rethook)