1 files changed, 4 insertions, 3 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index 53cab10fece4..4bde489ec431 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -69,9 +69,6 @@ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT;
 int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS;
 int heap_stack_gap = 0;
 
-/* amount of vm to protect from userspace access */
-unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
-
 atomic_long_t mmap_pages_allocated;
 
 EXPORT_SYMBOL(mem_map);
@@ -922,6 +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) &&