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

[Csaba Raduly <rcsaba gmail com>]

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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