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POMemory Access Violation inside CString
 

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  1. POMemory Access Violation inside CString
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    <p>I am using one Windows application which parses certain binary file. The app is crashing (Read access violation) every time at a certain location. </p> <p>I am trying to find out the root cause of the crash.</p> <pre><code>(f74.fac): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=02b74141 ebx=00000000 ecx=02760000 edx=00414141 esi=00000000 edi=01426fe4 eip=7c91081e esp=0012eb64 ebp=0012eb8c iopl=0 nv up ei ng nz na pe cy cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00010287 ntdll!RtlpImageNtHeader+0x35: 7c91081e 813850450000 cmp dword ptr [eax],4550h ds:0023:02b74141=???????? </code></pre> <p>At Crash Point:</p> <pre><code>0:000&gt; u eip ntdll!RtlpImageNtHeader+0x35: 7c91081e 813850450000 cmp dword ptr [eax],4550h 7c910824 0f858b830200 jne ntdll!RtlpImageNtHeader+0x3d (7c938bb5) 7c91082a 834dfcff or dword ptr [ebp-4],0FFFFFFFFh 7c91082e e8cfe5ffff call ntdll!_SEH_epilog (7c90ee02) 7c910833 c20400 ret 4 7c910836 90 nop 7c910837 90 nop 7c910838 ff ??? </code></pre> <p>Stack Trace :</p> <pre><code>0:000&gt; kb ChildEBP RetAddr Args to Child 0012eb8c 7c91708f 02760000 00000216 0012f3d0 ntdll!RtlpImageNtHeader+0x35 0012ee40 7c916042 02734da8 0012eeb8 00000000 ntdll!LdrpCheckForLoadedDll+0x4cd 0012f0fc 7c9162da 00000000 02734da8 0012f3f0 ntdll!LdrpLoadDll+0x1ba 0012f3a4 7c801bb9 02734da8 0012f3f0 0012f3d0 ntdll!LdrLoadDll+0x230 0012f40c 7c801d6e 7ffdec00 00000000 00000001 kernel32!LoadLibraryExW+0x18e *** WARNING: Unable to verify checksum for image00400000 *** ERROR: Module load completed but symbols could not be loaded for image00400000 0012f420 00407b8c 017f3ed8 00000000 00000001 kernel32!LoadLibraryExA+0x1f WARNING: Stack unwind information not available. Following frames may be wrong. 0012f4a4 7c80c710 73eae590 0012f49c 0012f558 image00400000+0x7b8c 0012f4c8 73dd4381 017f3ed8 017f3db8 00000047 kernel32!lstrlenA+0x3b 0012f528 73dd2263 0012f628 00000000 0012f4f0 MFC42!CString::CString+0x47 0012f538 73dd2725 017ef0ac 0012f628 00407846 MFC42!CFixedAlloc::Free+0x28 0012f544 00407846 0012f628 00000000 017ef158 MFC42!CString::~CString+0x1c 00000000 00000000 00000000 00000000 00000000 image00400000+0x7846 </code></pre> <p>Not sure,But I'm guessing its a problem related to heap as CString uses heap allocation. So please suggest the possible cause for this crash. Please let me know if more information is needed.</p> <p>Thanks in Advance,</p>
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    1. COIt's an access violation. Most likely from something in your code that is incorrect. Since you don't show any of your code, it's impossible for us to help.
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    2. COPlease share code...
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      1. USTushar Jadhav
    3. COActually its not my code.I'm using that compiled binary app.Will it help,if I share windbg crash dump ??
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