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Re: [libvirt] [PATCH] node_device_linux_sysfs.c: avoid opendir/fd leak on error path



Jim Meyering wrote:
> This looks pretty clear.
> It calls closedir upon successful return, but not in the error case.
>
>>From 526a2bc2d87f0bf7a0c16a2a96316e5c1d5dae2e Mon Sep 17 00:00:00 2001
> From: Jim Meyering <meyering redhat com>
> Date: Wed, 20 Jan 2010 17:49:35 +0100
> Subject: [PATCH] node_device_linux_sysfs.c: avoid opendir/fd leak on error path
>
> * src/node_device/node_device_linux_sysfs.c(get_virtual_functions_linux):
> Don't leak a DIR buffer and file descriptor on error path.
> ---
>  src/node_device/node_device_linux_sysfs.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/src/node_device/node_device_linux_sysfs.c b/src/node_device/node_device_linux_sysfs.c
> index ff7aaf0..e611e1a 100644
> --- a/src/node_device/node_device_linux_sysfs.c
> +++ b/src/node_device/node_device_linux_sysfs.c
> @@ -2,7 +2,7 @@
>   * node_device_hal_linuc.c: Linux specific code to gather device data
>   * not available through HAL.
>   *
> - * Copyright (C) 2009 Red Hat, Inc.
> + * Copyright (C) 2009-2010 Red Hat, Inc.
>   *
>   * This library is free software; you can redistribute it and/or
>   * modify it under the terms of the GNU Lesser General Public
> @@ -371,6 +371,8 @@ int get_virtual_functions_linux(const char *sysfs_path,
>      ret = 0;
>
>  out:
> +    if (dir)
> +        closedir(dir);
>      VIR_FREE(device_link);
>      return 0;
>  }

That patch is incomplete.  Would have been obvious if I'd included
a few more lines of context above that "out:" label:

    closedir(dir);
    ret = 0;

It lacked a last-minute addition that is required.
I'll fold this in:

diff --git a/src/node_device/node_device_linux_sysfs.c b/src/node_device/node_device_linux_sysfs.c
index e611e1a..674ee26 100644
--- a/src/node_device/node_device_linux_sysfs.c
+++ b/src/node_device/node_device_linux_sysfs.c
@@ -367,6 +367,7 @@ int get_virtual_functions_linux(const char *sysfs_path,
     }

     closedir(dir);
+    dir = NULL;

     ret = 0;


Here's the revised patch:

>From a331c0194def0fe24f8b40d4ef91525eacff4cfb Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering redhat com>
Date: Wed, 20 Jan 2010 17:49:35 +0100
Subject: [PATCH] node_device_linux_sysfs.c: avoid opendir/fd leak on error path

* src/node_device/node_device_linux_sysfs.c(get_virtual_functions_linux):
Don't leak a DIR buffer and file descriptor on error path.
---
 src/node_device/node_device_linux_sysfs.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/node_device/node_device_linux_sysfs.c b/src/node_device/node_device_linux_sysfs.c
index ff7aaf0..674ee26 100644
--- a/src/node_device/node_device_linux_sysfs.c
+++ b/src/node_device/node_device_linux_sysfs.c
@@ -2,7 +2,7 @@
  * node_device_hal_linuc.c: Linux specific code to gather device data
  * not available through HAL.
  *
- * Copyright (C) 2009 Red Hat, Inc.
+ * Copyright (C) 2009-2010 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -367,10 +367,13 @@ int get_virtual_functions_linux(const char *sysfs_path,
     }

     closedir(dir);
+    dir = NULL;

     ret = 0;

 out:
+    if (dir)
+        closedir(dir);
     VIR_FREE(device_link);
     return 0;
 }
--
1.6.6.516.gb72f


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