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Solved [L4d2] Crash on CMoveableCamera::FollowTarget() + 0x3b [PATCHED]


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KadabraZz
Senior Member
Join Date: May 2020
Old 08-22-2023 , 14:05   Re: [L4d2] Crash on CMoveableCamera::FollowTarget() + 0x3b
Reply With Quote #51

PHP Code:
L 08/22/2023 06:52:46: [SMException reportedFailed to loadbyte mis-match 17 (0xF1BC != 0x0D8B)
L 08/22/2023 06:52:46: [SMBlamingFIXES/FollowTarget_Detour.smx
L 08
/22/2023 06:52:46: [SMCall stack trace:
L 08/22/2023 06:52:46: [SM]   [0SetFailState
L 08
/22/2023 06:52:46: [SM]   [1Line 84C:\Users\Alex\Downloads\FollowTargetDHook\scripting\FollowTarget_Detour.sp::GetEntityListPtr
L 08
/22/2023 06:52:46: [SM]   [2Line 46C:\Users\Alex\Downloads\FollowTargetDHook\scripting\FollowTarget_Detour.sp::OnPluginStart
L 08
/22/2023 06:52:46: [SMUnable to load plugin "FIXES/FollowTarget_Detour.smx"Error detected in plugin startup (see error logs
Today =( thanks valve

Linux server Debian12

Last edited by KadabraZz; 08-22-2023 at 14:06.
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Dragokas
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Join Date: Nov 2017
Location: Ukraine on fire
Old 08-22-2023 , 16:57   Re: [L4d2] Crash on CMoveableCamera::FollowTarget() + 0x3b
Reply With Quote #52

@BRU7US, what connection does it have with my topic?
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Dragokas
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Join Date: Nov 2017
Location: Ukraine on fire
Old 08-22-2023 , 17:06   Re: [L4d2] Crash on CMoveableCamera::FollowTarget() + 0x3b [PATCHED]
Reply With Quote #53

@all, I think valve patched this bug. Fix is not required.

Before:
Code:
v1 = 0;
  if ( *((_DWORD *)this + 281) != -1
    && (char *)g_pEntityList + 16 * (*((_DWORD *)this + 281) & 0xFFF) != (void *)-4
    && *((_DWORD *)g_pEntityList + 4 * (*((_DWORD *)this + 281) & 0xFFF) + 2) == *((_DWORD *)this + 281) >> 12 )
  {
    v1 = *((_DWORD *)g_pEntityList + 4 * (*((_DWORD *)this + 281) & 0xFFF) + 1);
  }
  if ( (*(_BYTE *)(v1 + 333) & 8) != 0 )
    CBaseEntity::CalcAbsolutePosition((CBaseEntity *)v1);
After:
Code:
v1 = g_pEntityList;
  if ( *((_DWORD *)this + 281) == -1 )
    return (*(int (__thiscall **)(void *, CMoveableCamera *))(*(_DWORD *)this + 808))(v1, this);
  v2 = (char *)g_pEntityList + 16 * (*((_DWORD *)this + 281) & 0xFFF);
  v1 = v2 + 4;
  if ( v2 == (char *)-4 )
    return (*(int (__thiscall **)(void *, CMoveableCamera *))(*(_DWORD *)this + 808))(v1, this);
  if ( *((_DWORD *)g_pEntityList + 4 * (*((_DWORD *)this + 281) & 0xFFF) + 2) != *((_DWORD *)this + 281) >> 12 )
    return (*(int (__thiscall **)(void *, CMoveableCamera *))(*(_DWORD *)this + 808))(v1, this);
  v4 = *((_DWORD *)v2 + 1);
  if ( !v4 )
    return (*(int (__thiscall **)(void *, CMoveableCamera *))(*(_DWORD *)this + 808))(v1, this);
  if ( (*(_BYTE *)(v4 + 333) & 8) != 0 )
    CBaseEntity::CalcAbsolutePosition(*((CBaseEntity **)v2 + 1));
Context:
Code:
SIGSEGV /SEGV_MAPERR accessing 0x14d

Thread 0 (crashed):
   0: server_srv.so!CMoveableCamera::FollowTarget() + 0x3b
      eip: 0xedc4184b  esp: 0xffdb2c50  ebp: 0xffdb2d18  ebx: 0x115d2600
      esi: 0x00000000  edi: 0xed64d5e0  eax: 0x00000bce  ecx: 0xee2152e0
      edx: 0xee215320  efl: 0x00010202  

      edc41837  81 e2 ff 0f 00 00        and edx, 0xfff
      edc4183d  c1 e2 04                 shl edx, 0x4
      edc41840  01 ca                    add edx, ecx
      edc41842  39 42 08                 cmp [edx+0x8], eax
      edc41845  0f 84 8d 01 00 00        jz 0xedc419d8
  >   edc4184b  f6 86 4d 01 00 00 08     test byte [esi+0x14d], 0x8
      edc41852  0f 85 70 01 00 00        jnz 0xedc419c8
      edc41858  8b 86 7c 03 00 00        mov eax, [esi+0x37c]
      edc4185e  8b 8b 50 04 00 00        mov ecx, [ebx+0x450]
      edc41864  8b 93 54 04 00 00        mov edx, [ebx+0x454]
      edc4186a  f3 0f 10 9b 5c 04 00 00  movss xmm3, [ebx+0x45c]
esi is v1 in 1st code, and v4 in 2nd code.
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BRU7US
Member
Join Date: Jul 2020
Location: Tatarstan, Kazan
Old 08-22-2023 , 17:51   Re: [L4d2] Crash on CMoveableCamera::FollowTarget() + 0x3b
Reply With Quote #54

Quote:
Originally Posted by Dragokas View Post
@BRU7US, what connection does it have with my topic?
Just used this topic with a similar problem instead of creating a new...
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KadabraZz
Senior Member
Join Date: May 2020
Old 08-22-2023 , 18:54   Re: [L4d2] Crash on CMoveableCamera::FollowTarget() + 0x3b [PATCHED]
Reply With Quote #55

Thank you for your work on fixing the problem all this time, you can bet it helped a lot of people.
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HarryPotter
Veteran Member
Join Date: Sep 2017
Location: Taiwan, Asia
Old 08-22-2023 , 20:11   Re: [L4d2] Crash on CMoveableCamera::FollowTarget() + 0x3b [PATCHED]
Reply With Quote #56

Nice, valve fix
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