diff --git a/[refs] b/[refs]
index 933341a91a94..8bc90f34585e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 191529756633052680dd9d23ad63744ca5aa02a1
+refs/heads/master: 28d7a6ae92c099d81cbea08c20be0d2cf7ccd7ca
diff --git a/trunk/mm/nommu.c b/trunk/mm/nommu.c
index 28754c40be98..4bde489ec431 100644
--- a/trunk/mm/nommu.c
+++ b/trunk/mm/nommu.c
@@ -919,6 +919,10 @@ static int validate_mmap_request(struct file *file,
 		if (!file->f_op->read)
 			capabilities &= ~BDI_CAP_MAP_COPY;
 
+		/* The file shall have been opened with read permission. */
+		if (!(file->f_mode & FMODE_READ))
+			return -EACCES;
+
 		if (flags & MAP_SHARED) {
 			/* do checks for writing, appending and locking */
 			if ((prot & PROT_WRITE) &&