[LIP] Insmod Rmmod Insmod crash.

Hi,
I have written a module that crashes after insmod followed by rmmod followed by insmod. I am using kgdb and the crash is as below. When I do rmmod I am not freeing the memory that is I have allocated during the insmod. I want to know if it is because of that or it is because of wrong programming in registering netfilter hooks as the trace is showing that. I am also pasing few lines as how I am registering. Kindly help me. I feel that there is some thing to do with the priority of the hook. 

Trace:
Myfunction  init function success
the value 0the value 0
Program received signal SIGSEGV, Segmentation fault.
nf_register_hook (reg=0xc4877860) at netfilter.c:68
68                      if (reg->priority < ((struct nf_hook_ops *)i)->priority)(gdb) c
Continuing.
Can't send signals to this remote system.  SIGSEGV not sent.
<1>Unable to handle kernel paging request at virtual address c4888874
 printing eip:
c0202680
Program received signal SIGTRAP, Trace/breakpoint trap.
nf_register_hook (reg=0xc4877860) at netfilter.c:68
68                      if (reg->priority < ((struct nf_hook_ops *)i)->priority)(gdb) c
Continuing.
ipseckern
CPU:    0
EIP:    0010:[<c0202680>]    Tainted: PF
EFLAGS: 00010206

EIP is at nf_register_hook [kernel] 0x30 (2.4.18-14custom)
eax: c03def60   ebx: c4877860   ecx: 80000000   edx: c4888860
esi: 00000000   edi: 00000000   ebp: c14adef0   esp: c14adeec
ds: 0018   es: 0018   ss: 0018
Process insmod (pid: 1386, stackpage=c14ad000)
Stack: ffffffea c14adf10 c4858502 c4877860 00000000 c14adf10 c48584e0 00000000
       00000000 c14adfbc c011daa6 c4851060 4051b068 0002d7a0 c4872ccc 00000000
       4053a874 0001f86c 00000060 00000060 00000009 c0ba71e0 c0362000 c0595000
Call Trace: [<c4858502>] init_module [mymodule] 0x6a (0xc14adef4))
[<c4877860>] fsnethook_ops [mymodule] 0x0 (0xc14adef8))
[<c48584e0>] init_module [mymodule] 0x48 (0xc14adf04))
[<c011daa6>] sys_init_module [kernel] 0x526 (0xc14adf14))
[<c4851060>] MyEncode [mymodule] 0x0 (0xc14adf18))
[<c4872ccc>] __ksymtab [ipseckern] 0x0 (0xc14adf24))
[<c4851060>] MyEncode [mymodule] 0x0 (0xc14adf58))
[<c010932f>] system_call [kernel] 0x33 (0xc14adfc0))


code piece:
static struct nf_hook_ops nethook_ops[] = {
        {{ NULL, NULL} ,nethook_my_function1, PF_INET,
                NF_IP_PRE_ROUTING, NF_IP_PRI_FIRST},

        {{ NULL, NULL} ,nethook_my_function2, PF_INET,
                NF_IP_POST_ROUTING, NF_IP_PRI_FIRST},
};

int
init_module(void)
{
        /*pre routing and then post routing*/

        nf_register_hook( &nethook_ops[0]);

        nf_register_hook( &nvoidethook_ops[1]);

        return 0;
}                             
clean_module(void)
{
        /* Unregistering pre and post hooks*/
        nf_unregister_hook( &nethook_ops[0]);

        nf_unregister_hook( &nethook_ops[1]);

        return;
}
                         


                            

V.V Suresh Kumar


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