From 04e04562323a40843024ca2facc0720af1c5777a Mon Sep 17 00:00:00 2001
From: "Shiratori, Takehiro" <fj0300es@aa.jp.fujitsu.com>
Date: Wed, 17 Oct 2018 15:08:28 +0900
Subject: [PATCH] set_mempolicy(): Add mode check.

Fix a problem that does not result in an error even
if MPOL_F_STATIC_NODES and MPOL_F_RELATIVE_NODES are
simultaneously specified in set_mempolicy() mode.

Change-Id: I06e695baf869daee8bc64179748cac27b64e914b
Fujitsu: POSTK_DEBUG_TEMP_FIX_99
---
 kernel/syscall.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index 2464fa0d..f8a92b82 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -8706,6 +8706,11 @@ SYSCALL_DECLARE(set_mempolicy)
 		}
 	}
 
+	if ((mode & MPOL_F_STATIC_NODES) &&
+	    (mode & MPOL_F_RELATIVE_NODES)) {
+		error = -EINVAL;
+		goto out;
+	}
 	mode &= ~MPOL_MODE_FLAGS;
 
 	switch (mode) {