Re: g_free throwing an exception

[Paul Offord <Paul.Offord () advance7 com>]

No, Pascal is quite right.  In my dissector I pointed the hf fields to some fixed values in an array.  Added some 
g_strdup functions and, voila, it all works.

Thanks both.

Best regards…Paul

From: Wireshark-dev [mailto:wireshark-dev-bounces () wireshark org] On Behalf Of Graham Bloice
Sent: 06 November 2017 10:50
To: Developer support list for Wireshark <wireshark-dev () wireshark org>
Subject: Re: [Wireshark-dev] g_free throwing an exception



On 5 November 2017 at 21:33, Pascal Quantin <pascal.quantin () gmail com<mailto:pascal.quantin () gmail com>> wrote:
Hi Paul,

2017-11-05 12:15 GMT+01:00 Paul Offord <Paul.Offord () advance7 com<mailto:Paul.Offord () advance7 com>>:
Hi,

I am working on a plugin dissector.  It works OK except when I change profiles Wireshark throws an exception in code in 
proto.c as follows:

static void
free_deregistered_field (gpointer data, gpointer user_data _U_)
{
               header_field_info *hfi = (header_field_info *) data;
               gint hf_id = hfi->id;

               g_free((char *)hfi->name);      <== The exception occurs on execution of this call

The hfi structure looks valid and the hfi->name does point to a character string.

The only thing I can see that might be wrong is that hfi->name has a data type of const char *

How can I determine the cause of the exception?

Usually this is a sign of an attempt to free a memory block that was not allocated with g_malloc. Is it a field from 
your plugin?

BR,
Pascal.



This might also be a case of mixed MSVCRT libraries.  If compiling with VS2013 are you using VS2013 third party 
libraries?

--
Graham Bloice

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