1 files changed, 4 insertions, 0 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 339cf5c4d5d8..e7a5a68a9c2e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1030,6 +1030,10 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
         } else {
                 switch (flags & MAP_TYPE) {
                 case MAP_SHARED:
+                        /*
+                         * Ignore pgoff.
+                         */
+                        pgoff = 0;
                         vm_flags |= VM_SHARED | VM_MAYSHARE;
                         break;
                 case MAP_PRIVATE: