[MIPS] sys_mmap2 offset argument should always be shifted 12, not PAGE_SHIFT.

[safe/jmp/linux-2.6] / arch / mips / kernel / linux32.c

diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 1e8d248..013bc93 100644 (file)
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -106,6 +106,10 @@ sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
        unsigned long error;
 
        error = -EINVAL;
+       if (pgoff & (~PAGE_MASK >> 12))
+               goto out;
+       pgoff >>= PAGE_SHIFT-12;
+
        if (!(flags & MAP_ANONYMOUS)) {
                error = -EBADF;
                file = fget(fd);