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-rw-r--r--arch/sh/kernel/sys_sh.c9
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);
}