Wireshark · Wireshark-dev: Re: [Wireshark-dev] g_free throwing an exception

[Paul Offord <Paul.Offord@xxxxxxxxxxxx>]

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@xxxxxxxxxxxxx] On Behalf Of Graham Bloice
Sent: 06 November 2017 10:50
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] g_free throwing an exception

 

 

 

On 5 November 2017 at 21:33, Pascal Quantin <pascal.quantin@xxxxxxxxx> wrote:

Hi Paul,

 

2017-11-05 12:15 GMT+01:00 Paul Offord <Paul.Offord@xxxxxxxxxxxx>:

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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