[PATCH] NFS client O_DIRECT error case fix

The NFS direct-io error return path for request sizes greater than
MAX_DIRECTIO_SIZE fails to initialize the returned page struct array
pointer to NULL.

Discovered using AKPM's ext3-tools: odwrite -ko 0 16385 foo
Signed-off-by: Bill Rugolsky <brugolsky@telemetry-investments.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfs/direct.c

@@ -72,8 +72,10 @@ nfs_get_user_pages(int rw, unsigned long user_addr, size_t size,
 	size_t array_size;
 
 	/* set an arbitrary limit to prevent arithmetic overflow */
-	if (size > MAX_DIRECTIO_SIZE)
+	if (size > MAX_DIRECTIO_SIZE) {
+		*pages = NULL;
 		return -EFBIG;
+	}
 
 	page_count = (user_addr + size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	page_count -= user_addr >> PAGE_SHIFT;