Out of bound write due to malformed GIF while being parsed in 2d.x3d

Crash Dump:


2d.x3d + 0x7892 (id: 36b, no function symbol available)
2d.x3d + 0x79C5 (id: b6a, no function symbol available)
2d.x3d + 0x2A32 (no function symbol available)
rt3d.dll + 0x1076DD (no function symbol available)
rt3d.dll + 0xCACC7 (no function symbol available)
rt3d.dll!GetPicture + 0x2E


eax=00000100 ebx=00cff128 ecx=4d6ca000 edx=000001d9 esi=0000007e edi=35154e20
eip=6e207892 esp=00cff0f0 ebp=00cff118 iopl=0         nv up ei ng nz ac pe cy
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010297
fpcw=027F: rn 53 puozdi  fpsw=4020: top=0 cc=1000 --p-----  fptw=FFFF
fopcode=0000  fpip=0000:6e4e5d0c  fpdp=0000:00000000
st0= 0.000000000000000000000e+0000  st1= 0.000000000000000000000e+0000
st2= 0.000000000000000000000e+0000  st3= 5.300000000000000000000e+0001
st4= 5.000000000000000000000e+0000  st5= 4.800000000000000000000e+0001
st6= 1.000000000000000000000e+0000  st7= 0.000000000000000000000e+0000
mm0=0000000000000000  mm1=0000000000000000
mm2=0000000000000000  mm3=d400000000000000
mm4=a000000000000000  mm5=c000000000000000
mm6=8000000000000000  mm7=0000000000000000
xmm0=0 0 0 0
xmm1=0 0 0 0
xmm2=0 0 0 0
xmm3=0 0 0 0
xmm4=0 0 0 0
xmm5=0 0 0 0
xmm6=0.0213317 4.23622e-037 0.0252379 4.23622e-037
xmm7=0.0213317 4.23622e-037 0.0138976 7.51864e+029
dr0=00000000 dr1=00000000 dr2=00000000
dr3=00000000 dr6=00000000 dr7=00000000
6e207892 8801            mov     byte ptr [ecx],al          ds:002b:4d6ca000=?? 

Disassembly of stack frame 1 at 2d.x3d + 0x7892

6e2077ee 8bf8            mov     edi,eax
6e2077f0 e87efcffff      call    2d!E3DLLFunc+0x55b5 (6e207473)
6e2077f5 03f8            add     edi,eax
6e2077f7 33c9            xor     ecx,ecx
6e2077f9 33c0            xor     eax,eax
6e2077fb 663b4312        cmp     ax,word ptr [ebx+12h]
6e2077ff 7314            jae     2d!E3DLLFunc+0x5957 (6e207815)
6e207801 8b55f0          mov     edx,dword ptr [ebp-10h]
6e207804 8a044a          mov     al,byte ptr [edx+ecx*2]
6e207807 8807            mov     byte ptr [edi],al
6e207809 037b08          add     edi,dword ptr [ebx+8]
6e20780c 41              inc     ecx
6e20780d 0fb74312        movzx   eax,word ptr [ebx+12h]
6e207811 3bc8            cmp     ecx,eax
6e207813 7cef            jl      2d!E3DLLFunc+0x5946 (6e207804)
6e207815 0fb74314        movzx   eax,word ptr [ebx+14h]
6e207819 46              inc     esi
6e20781a 8b7df0          mov     edi,dword ptr [ebp-10h]
6e20781d 3bf0            cmp     esi,eax
6e20781f 7caf            jl      2d!E3DLLFunc+0x5912 (6e2077d0)
6e207821 8b4df4          mov     ecx,dword ptr [ebp-0Ch]
6e207824 0fb74316        movzx   eax,word ptr [ebx+16h]
6e207828 41              inc     ecx
6e207829 894df4          mov     dword ptr [ebp-0Ch],ecx
6e20782c 3bc8            cmp     ecx,eax
6e20782e 7c96            jl      2d!E3DLLFunc+0x5908 (6e2077c6)
6e207830 57              push    edi
6e207831 e986000000      jmp     2d!E3DLLFunc+0x59fe (6e2078bc)
6e207836 50              push    eax
6e207837 e80db70500      call    2d!zlibVersion+0x2139 (6e262f49)
6e20783c 59              pop     ecx
6e20783d 8bc8            mov     ecx,eax
6e20783f 33ff            xor     edi,edi
6e207841 33c0            xor     eax,eax
6e207843 894df0          mov     dword ptr [ebp-10h],ecx
6e207846 897de4          mov     dword ptr [ebp-1Ch],edi
6e207849 663b4316        cmp     ax,word ptr [ebx+16h]
6e20784d 736c            jae     2d!E3DLLFunc+0x59fd (6e2078bb)
6e20784f 33c0            xor     eax,eax
6e207851 33f6            xor     esi,esi
6e207853 663b4314        cmp     ax,word ptr [ebx+14h]
6e207857 7353            jae     2d!E3DLLFunc+0x59ee (6e2078ac)
6e207859 8b4b04          mov     ecx,dword ptr [ebx+4]
6e20785c 0fb74312        movzx   eax,word ptr [ebx+12h]
6e207860 50              push    eax
6e207861 ff75f0          push    dword ptr [ebp-10h]
6e207864 8b11            mov     edx,dword ptr [ecx]
6e207866 51              push    ecx
6e207867 ff523c          call    dword ptr [edx+3Ch]
6e20786a 56              push    esi
6e20786b 8bcb            mov     ecx,ebx
6e20786d e8b5fcffff      call    2d!E3DLLFunc+0x5669 (6e207527)
6e207872 57              push    edi
6e207873 8bcb            mov     ecx,ebx
6e207875 8945e8          mov     dword ptr [ebp-18h],eax
6e207878 e8f6fbffff      call    2d!E3DLLFunc+0x55b5 (6e207473)
6e20787d 8b4de8          mov     ecx,dword ptr [ebp-18h]
6e207880 33d2            xor     edx,edx
6e207882 03c8            add     ecx,eax
6e207884 33c0            xor     eax,eax
6e207886 663b4312        cmp     ax,word ptr [ebx+12h]
6e20788a 7317            jae     2d!E3DLLFunc+0x59e5 (6e2078a3)
6e20788c 8b7df0          mov     edi,dword ptr [ebp-10h]
6e20788f 8a043a          mov     al,byte ptr [edx+edi]
6e207892 8801            mov     byte ptr [ecx],al // current instruction
6e207894 034b08          add     ecx,dword ptr [ebx+8]
6e207897 42              inc     edx
6e207898 0fb74312        movzx   eax,word ptr [ebx+12h]
6e20789c 3bd0            cmp     edx,eax
6e20789e 7cef            jl      2d!E3DLLFunc+0x59d1 (6e20788f)
6e2078a0 8b7de4          mov     edi,dword ptr [ebp-1Ch]
6e2078a3 0fb74314        movzx   eax,word ptr [ebx+14h]
6e2078a7 46              inc     esi
6e2078a8 3bf0            cmp     esi,eax
6e2078aa 7cad            jl      2d!E3DLLFunc+0x599b (6e207859)
6e2078ac 0fb74316        movzx   eax,word ptr [ebx+16h]
6e2078b0 47              inc     edi
6e2078b1 897de4          mov     dword ptr [ebp-1Ch],edi
6e2078b4 3bf8            cmp     edi,eax
6e2078b6 7c97            jl      2d!E3DLLFunc+0x5991 (6e20784f)
6e2078b8 8b4df0          mov     ecx,dword ptr [ebp-10h]
6e2078bb 51              push    ecx
6e2078bc e8a7b60500      call    2d!zlibVersion+0x2158 (6e262f68)
6e2078c1 59              pop     ecx
6e2078c2 6a02            push    2
6e2078c4 58              pop     eax
6e2078c5 66394316        cmp     word ptr [ebx+16h],ax
6e2078c9 7507            jne     2d!E3DLLFunc+0x5a14 (6e2078d2)
6e2078cb 8bcb            mov     ecx,ebx
6e2078cd e868fcffff      call    2d!E3DLLFunc+0x567c (6e20753a)
6e2078d2 33c0            xor     eax,eax
6e2078d4 40              inc     eax
6e2078d5 5f              pop     edi
6e2078d6 5e              pop     esi
6e2078d7 5b              pop     ebx
6e2078d8 8be5            mov     esp,ebp