Share Fix For Gf83 Crash With Requestexenchantskillinfo

[eressea]

DoS exploit: http://www.maxcheaters.com/topic/203384-crashing-l2off-server-with-requestexenchantskillinfo-packet/

Fix:

 

hook function 0x44BD0C (at 0x91A6C8 and maybe other places):

 

void* __cdecl fix44BD0C(void *self, UINT32 &type)

{

    typedef void* (__cdecl *t)(void*, UINT32&);

    t f = reinterpret_cast<t>(0x44BD0C);

    if (type > 3) {

        type = 0;

    }

    return f(self, type);

}

EDIT: Relevant addresses:

 

0x75374C+0xC3

0x7538C4+0xB5

0x7539CC+0xCB

0x91A5EC+0xDC

0x91A734+0xDC

0x91A87C+0xB8

0x91A984+0xB8

0x91AA8C+0xB8

0x91AB94+0xB8

 

Edited June 18, 2016 by eressea