mm/memunmap: don't access uninitialized memmap in memunmap_pages()

[linux-2.6-block.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index b75d458f817de6bea3d15130351940847e0c5145..fe0e9e1410fee30b05b725582ae460f66f997351 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3026,7 +3026,7 @@ void *copy_mount_options(const void __user * data)
         * the remainder of the page.
         */
        /* copy_from_user cannot cross TASK_SIZE ! */
-       size = TASK_SIZE - (unsigned long)data;
+       size = TASK_SIZE - (unsigned long)untagged_addr(data);
        if (size > PAGE_SIZE)
                size = PAGE_SIZE;