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Wireshark-dev: Re: [Wireshark-dev] Out of Memory issue

From: "Kumar, Hemant" <kumarh@xxxxxxxxxxxx>
Date: Fri, 25 Jul 2008 14:20:28 -0700

Hello Harris

 

Below is the code section from my packet_myprotocol.c.

I was able to finally locate the memory issue with code snippet;--

If I comment this, everything works fine.

So am I wrong in allocating memory for the string which I want to display in INFO section for the message

in display pane.

      `           #define STRING_BUFFER 256

                  Char *temp_str = NULL;

 

/* Clear out the stuff in info column*/

                  if (check_col(pinfo->cinfo,COL_INFO))

                  {

                        col_clear(pinfo->cinfo,COL_INFO);  

                  }

 

                  if (check_col(pinfo->cinfo,COL_INFO))

                  {

                       

                        temp_str = ep_alloc(STRING_BUFFER);

                        g_snprintf( temp_str, sizeof(temp_str), "[%s] %s ", message->direction, message->message_type);

                        col_add_str(pinfo->cinfo, COL_INFO, temp_str);

                             

                  }

 

Do I need to use some other fucntion to deallocate memory for temp_str?

Because my guess was that it will be automatically taken care off by g_snprintf() by use of g_free().

 

Thanks for all your inputs. I think I am pretty close to resolving this bug of mine.

 

Thanks

Hemant

 

                   

-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: Friday, July 25, 2008 12:00 PM
To: Developer support list for Wireshark
Subject: Re: [Wireshark-dev] Out of Memory issue

 

 

On Jul 24, 2008, at 5:12 PM, Kumar, Hemant wrote:

 

> It dies out in following TRY statement:--

> 

> TRY {

>         read_packet(cf, dfcode, data_offset);

>     }

>     CATCH(OutOfMemoryError) {

> 

> |

> |

> |

> |

>     }

>     ENDTRY;

>   }

 

Presumably that's the statement in cf_read() in file.c (i.e.,

presumably your dissector isn't itself reading packets).

 

> Any idea or any memory management routine which needs to be

> implemented in my

> Plugin dissector code?

 

We'd probably need to see your dissector to see if it's leaking

memory, or if it's correctly using some Wireshark facility that uses a

lot of memory.

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