Wireshark-dev: [Wireshark-dev] Segmentation fault in dissector
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From: <taraniteja.vishwanatha@xxxxxxxxx>
Date: Tue, 27 Mar 2007 16:28:30 +0530

Hi ,

 

We are using a 32 bit machine and dissector is working fine. The same dissector when used in a 64 bit m/c is giving problems. I would like to know how is it going to get affected in the change of environment, because initially it did not even compile properly .While testing in a 64 bit machine the wireshark is getting crashed giving the following error:

 

Inside unpack digits , length = 29 and offset is = 18

 

 

 

Program received signal SIGSEGV, Segmentation fault.

[Switching to Thread 182924546464 (LWP 1776)]

0x0000002a9b46afb7 in unpack_digits (tvb=0x10dfbd8, offset=18, dgt=0x2a9b588e78) at packet-xxx.c:4488

4488                    digit_str[i] = dgt->out[octet & 0x0f];

(gdb)

 

 

The code for unpack digits is as follows:

 

static char*

unpack_digits(tvbuff_t *tvb, int offset, dgt_set_t *dgt){

 

        int length, length_fake, offset_fake, counter=0;

        guint8 octet, num_of_digits_imsi;

        int i=0;

        char *digit_str;

 

        length = tvb_length(tvb);

        printf("\n\nInside unpack digits , length = %d and offset is = %d\n\n",length,offset);

        if (length < offset)

                return "";

        digit_str = ep_alloc((length - offset)*2+1);

 

        offset_fake = offset-1;

        num_of_digits_imsi = tvb_get_guint8(tvb,offset_fake);

        if( (num_of_digits_imsi % 2) == 0 )

                        length_fake = num_of_digits_imsi / 2;

        else

                        length_fake = (num_of_digits_imsi+1)/2;

 

        printf("\noffset_fake = %d\tnum_of_digits_imsi = %d\tlength_fake =  %d",offset_fake,num_of_digits_imsi,length_fake);

        while ( counter < length_fake ){

 

                octet = tvb_get_guint8(tvb,offset);

 

                digit_str[i] = dgt->out[octet & 0x0f];

                i++;

 

                /* unpack second value in byte */

                octet = octet >> 4;

 

                if (octet == 0x0f)      /* odd number bytes - hit filler */

                        break;

 

                digit_str[i] = dgt->out[octet & 0x0f];

                i++;

                offset++;

                counter++;

 

        }

        digit_str[i]= '\0';

        return digit_str;

}

 

 

Can anybody please help???

 

Regards,

Tarani

 

 


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