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Re: [libvirt] [PATCH] storage_backend.c: assure clang that inputvol can't be NULL



Daniel P. Berrange wrote:
> On Thu, Sep 03, 2009 at 11:18:00AM +0200, Jim Meyering wrote:
>> clang was complaining that a NULL inputvol would be dereferenced
>> in that "could not open..." diagnostic.
>>
>> Since the two sole callers of this function are careful
>> to call it only when inputvol is non-NULL, this is a good
>> case for giving the parameter the nonnull attribute:

When I recompiled everything, this patch needed adjustment.
For example, I had to include internal.h for the definition
of ATTRIBUTE_NONNULL.

>From 20229d1c5cb35221cc72ec37f4204e5f80cda4a9 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering redhat com>
Date: Thu, 3 Sep 2009 10:22:57 +0200
Subject: [PATCH 1/4] storage_backend.c: assure clang that inputvol can't be NULL

* src/storage_backend.c: Include "internal.h".
(virStorageBackendCopyToFD): Mark inputvol parameter as "nonnull".
Remove test for non-NULL inputvol.  Both callers ensure it's non-NULL.
---
 src/storage_backend.c |   17 ++++++++---------
 1 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/src/storage_backend.c b/src/storage_backend.c
index c818142..77243ef 100644
--- a/src/storage_backend.c
+++ b/src/storage_backend.c
@@ -1,7 +1,7 @@
 /*
  * storage_backend.c: internal storage driver backend contract
  *
- * Copyright (C) 2007-2008 Red Hat, Inc.
+ * Copyright (C) 2007-2009 Red Hat, Inc.
  * Copyright (C) 2007-2008 Daniel P. Berrange
  *
  * This library is free software; you can redistribute it and/or
@@ -47,6 +47,7 @@
 #include "util.h"
 #include "memory.h"
 #include "node_device.h"
+#include "internal.h"

 #include "storage_backend.h"

@@ -103,7 +104,7 @@ enum {
     TOOL_QCOW_CREATE,
 };

-static int
+static int ATTRIBUTE_NONNULL (3)
 virStorageBackendCopyToFD(virConnectPtr conn,
                           virStorageVolDefPtr vol,
                           virStorageVolDefPtr inputvol,
@@ -119,13 +120,11 @@ virStorageBackendCopyToFD(virConnectPtr conn,
     char zerobuf[512];
     char *buf = NULL;

-    if (inputvol) {
-        if ((inputfd = open(inputvol->target.path, O_RDONLY)) < 0) {
-            virReportSystemError(conn, errno,
-                                 _("could not open input path '%s'"),
-                                 inputvol->target.path);
-            goto cleanup;
-        }
+    if ((inputfd = open(inputvol->target.path, O_RDONLY)) < 0) {
+        virReportSystemError(conn, errno,
+                             _("could not open input path '%s'"),
+                             inputvol->target.path);
+        goto cleanup;
     }

     bzero(&zerobuf, sizeof(zerobuf));
--
1.6.4.2.395.ge3d52


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