[PATCH] uclinux: fix mmap() of directory for nommu case

[powerpc.git] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index 8bdde95..6a2a8aa 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -497,15 +497,17 @@ static int validate_mmap_request(struct file *file,
            (flags & MAP_TYPE) != MAP_SHARED)
                return -EINVAL;
 
-       if (PAGE_ALIGN(len) == 0)
-               return addr;
-
-       if (len > TASK_SIZE)
+       if (!len)
                return -EINVAL;
 
+       /* Careful about overflows.. */
+       len = PAGE_ALIGN(len);
+       if (!len || len > TASK_SIZE)
+               return -ENOMEM;
+
        /* offset overflow? */
        if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
-               return -EINVAL;
+               return -EOVERFLOW;
 
        if (file) {
                /* validate file mapping requests */