Re: [xml] xmlFreeDoc() on iOS 4 - crashes

["Chi Yin Luk" <ChiYinL warshawgroup com>]

Hi Csaba,

Thanks X 1000 man!
It worked by doing xmlStrDup()! But I am just wondering why it would not
crash when running on iOS 3.2 or older.

Thanks,
Chi Yin Luk
 
Warshaw Group 
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New York, NY 10012
phone: 212.966.4056, x. 201
fax: 212.966.4017 
email: chiyinl warshawgroup com
http://www.warshawgroup.com

-----Original Message-----
From: Csaba Raduly [mailto:rcsaba gmail com] 
Sent: Thursday, October 14, 2010 3:28 AM
To: Chi Yin Luk
Cc: xml gnome org
Subject: Re: [xml] xmlFreeDoc() on iOS 4 - crashes

Hi,

On Wed, Oct 13, 2010 at 9:54 PM, Chi Yin Luk  wrote:
> I am using libxml2.2.7.3.dylib on my iPhone application.
>
> The application is targeting iOS 3.2, but the xmlFreeDoc() fails when
the
> application is running on iPhone 4, but not on iOS 3.2 or before.
>
> I also tried targeting iOS 4 and running on iPhone 4, same problem
exist.
> The problem is if I assign the encocoding of xmlDocPtr , then call
> xmlFreeDoc to free the xmlDocPtr, it crashes with message:
>
> "pointer being freed was not allocated"
>
> The snippet of code as follow:

> xmlDocPtr doc;
> doc = xmlNewDoc((cost xmlChar*)XML_DEFAULT_VERSION);
> doc->encoding ="utf-8";
> xmlFreeDoc(doc);

xmlFreeDoc does a xmlFree on doc->encoding, but you set it to a string
which was not dynamically allocated. In effect, you are calling
xmlFree on the "utf-8" string literal. This is wrong. You need to do
at least this:

doc->encoding = xmlStrDup("utf-8");

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