s390/uaccess: use sane length for __strncpy_from_user()

[karo-tx-linux.git] / arch / s390 / lib / uaccess.c

diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index 1e5bb2b86c423fefee7987ec45483077748e8ca8..b3bd3f23b8e851c7f67e46cb527e20603512e7f5 100644 (file)
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -337,8 +337,8 @@ long __strncpy_from_user(char *dst, const char __user *src, long size)
                return 0;
        done = 0;
        do {
-               offset = (size_t)src & ~PAGE_MASK;
-               len = min(size - done, PAGE_SIZE - offset);
+               offset = (size_t)src & (L1_CACHE_BYTES - 1);
+               len = min(size - done, L1_CACHE_BYTES - offset);
                if (copy_from_user(dst, src, len))
                        return -EFAULT;
                len_str = strnlen(dst, len);