From 9e31ee3438d4edf14df13555cf74648c2451ae7c Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <mars@box>
Date: Wed, 20 Dec 2017 17:14:08 +0100
Subject: [PATCH] main: silence annoying userspace error

---
 kernel/sy_old/mars_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/sy_old/mars_main.c b/kernel/sy_old/mars_main.c
index f3b6b2d5..5cb33730 100644
--- a/kernel/sy_old/mars_main.c
+++ b/kernel/sy_old/mars_main.c
@@ -5009,7 +5009,7 @@ static const struct main_class main_classes[] = {
 	[CL_GLOBAL_USERSPACE_ITEMS] = {
 		.cl_name = "",
 		.cl_len = 0, // catch any
-		.cl_type = 'l',
+		.cl_type = 'L',
 		.cl_father = CL_GLOBAL_USERSPACE,
 	},
 
@@ -5176,7 +5176,7 @@ static const struct main_class main_classes[] = {
 	[CL_RESOURCE_USERSPACE_ITEMS] = {
 		.cl_name = "",
 		.cl_len = 0, // catch any
-		.cl_type = 'l',
+		.cl_type = 'L',
 		.cl_father = CL_RESOURCE_USERSPACE,
 	},
 
@@ -5569,6 +5569,12 @@ static int main_worker(struct mars_global *global, struct mars_dent *dent, bool
 			return -EINVAL;
 		}
 		break;
+	case 'L':
+		if (!S_ISLNK(dent->new_stat.mode)) {
+			/* ignore silently */
+			return -EINVAL;
+		}
+		break;
 	}
 	if (likely(class > CL_ROOT)) {
 		int father = main_classes[class].cl_father;