Access violation on a WindowsXP gameserver program
From: Arislan (none_at_no.111.1X)
Date: 02/29/04
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Date: Sun, 29 Feb 2004 03:17:10 -0500
I am trying to play a networked game and I have found that when
someone uses a simple telnet command and telnets to my server instead
of using the game client, the game server crashes. I only have the
bins for the exe and not the source code, so I am attempting to fix it
with Ollydbg and HexWorkshop.
I ran the program from within Ollydbg and then telnetted to it myself.
It crashed and gave me "Access Violation when reading[A7738384] - use
shift+F7 to pass exception to program". It highlighted the line
0047B20E . I copied and pasted here a sample of that area.
0047B1F8 |> 837D F4 00 /CMP DWORD PTR SS:[EBP-C],0
0047B1FC |. 0F85 A1000000 |JNZ GServer.0047B2A3
0047B202 |. 8B55 FC |MOV EDX,DWORD PTR SS:[EBP-4]
0047B205 |. 8B82 F0CC0E00 |MOV EAX,DWORD PTR DS:[EDX+ECCF0]
0047B20B |. 8B4D FC |MOV ECX,DWORD PTR SS :[EBP-4]
0047B20E |. 83BC81 9CCC0E0>|CMP DWORD PTR DS :[ECX+EAX*4+ECC9C],0
0047B216 |. 74 1F |JE SHORT GServer.0047B237
How do i find the exact value or instruction that is causing the
crashing, by following this clue?
Thanks.
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