Bug in Riched20.dll using EM_STREAMOUT XP

Hello

It seems that something has broken my routine to read RTF controls - at least I remember it working earlier.

I get the first (and only) fragment of it in p_szB of my structure but then it crashes after that my routine is back.

struct RTFdumpInfo {char * p_szB, * p_sz;} DWORD dwFree; };

DWORD RTFdumpCallback(DWORD_PTR pp_In, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
struct RTFdumpInfo * p_di = (struct RTFdumpInfo *) pp_In;   char * p_sz;   DWORD dw;
 
If (p_di-> p_szB ==) NULL)
{
p_di-> p_szB = p_di-> p_sz = malloc(1000002L);   p_di-> dwFree = 1000000L; p_di-> p_sz [0] = 0;
}
If (p_di-> dwFree<>
{
DW = p_di-> p_sz - p_di-> p_szB;  If ((p_sz = realloc (p_di-> p_szB, dw + 200001L)) == NULL) return 1;
p_di-> dwFree = 200000L; p_di-> p_sz = (p_di-> p_szB = p_sz) + dw;
}
memcpy (p_di-> p_sz, (void *) pbBuff, cb); p_di-> p_sz += cb; p_di-> p_sz [0] = 0;
p_di-> dwFree = cb; * pcb = cb; return 0;
}

Essentials of the appellant:

EDITSTREAM are;
struct RTFdumpInfo di;

di.p_szB = null; are .dwCookie = (DWORD_PTR) &di; .pfnCallback = (EDITSTREAMCALLBACK) RTFdumpCallback;
SendMessage (hwndRTF, EM_STREAMOUT, SF_RTFNOOBJS, (LPARAM) &es);)

What I get after entering complete RTF code my stamp and the return of the recall is:

Unhandled exception at 0x74e730ae (riched20.dll) in myapp.exe: 0xC0000005: access reading location 0 violation x 00000014.

Call stack:

Riched20.dll! CRTFWrite::WriteRtf() + 0x6a0 bytes
Riched20.dll! CLightDTEngine::SaveToEs() + 0 x 32 bytes
Riched20.dll! CTxtEdit::TxSendMessage() + 0x120a bytes
Riched20.dll!_RichEditWndProc@16 () + 0xa62 byte
Riched20.dll! CW32System::ANSIWndProc() + 0x2a4 bytes
Riched20.dll!_RichEditANSIWndProc@16 () + 0 x 25 bytes
user32.dll!_InternalCallWinProc@20 () + 0 x 28 bytes
user32.dll!_UserCallWinProcCheckWow@32 () + 0xb7 bytes
user32.dll!_SendMessageWorker@20 () + 0xc8 bytes
user32.dll!_SendMessageA@16 () + 0 x 49 bytes

Code exec to the arrow pointer:

Call CRTFWrite::FlushBuffer (74E70950h) 74E73095
74E7309A push dword ptr [ebp - 2Ch]
Call CW32System::FreePv (74E31CE0h) 74E7309D
74E730A2 mov eax, dword ptr [esi + 20 h]
74E730A5 test eax, eax
74E730A7 pop edi
74E730A8 pop ebx
74E730A9 I 74E730C3
74E730AB mov ecx, dword ptr [esi + 2Ch]
74E730AE cmp dword ptr [ecx + 4], 0<>
74E730B2 jne 74E730BF
74E730B4 test eax, eax
74E730B6 jge 74E730BA
74E730B8 neg eax
74E730BA neg eax
74E730BC mov dword ptr [ecx + 4], eax
74E730BF and dword ptr [esi + 64 h], 0
74E730C3 mov eax, dword ptr [esi + 64 h]
74E730C6 pop esi
74E730C7 vacation
74E730C8 ret

Registry values to the breaking point:

EAX = EBX = 00000449 0012A7BC
ECX = 00000010 EDX = 00170608
ESI = 00127F8C EDI = 00126A 54
EIP = 74E730AE ESP = 001267F4
EBP = 0012688C EFL = 00000202

In the case of test, I got all RTF code in my buffer. I also tried to have callback returns 1 (default) instead of 0 but the result is the same.
I don't see why what the esi + 2Ch would value 16. in the EDITSTREAM structure dwError is 0.

This is performed on a XP with the latest patches and using C:\WINDOWS\system32\riched20.dll version 5.30.23.1230 loaded in the range 74E30000-74E9D000.

Someone has some ideas, what is the cause? What is a recent XP patch he has somehow broken?
And then the riched20.dll has not changed since 2008-04-14 03:12. And other works of apps very well.

Hello

The question you posted would be better suited in the MSDN development forums.
http://social.msdn.Microsoft.com/forums/en-us/categories

Tags: Windows

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