1 files changed, 9 insertions, 0 deletions

diff --git a/arch/sh/kernel/sys_sh.c b/arch/sh/kernel/sys_sh.c
index 58dfc02c7af1..e3a7e36639ef 100644
--- a/arch/sh/kernel/sys_sh.c
+++ b/arch/sh/kernel/sys_sh.c
@@ -63,6 +63,15 @@ asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
         unsigned long prot, unsigned long flags,
         unsigned long fd, unsigned long pgoff)
 {
+        /*
+         * The shift for mmap2 is constant, regardless of PAGE_SIZE
+         * setting.
+         */
+        if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
+                return -EINVAL;
+
+        pgoff >>= PAGE_SHIFT - 12;
+
         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 }