New subject: [Bug 57817] mvscp90 ::std::ifstream::seekg(0) crashes

9 Feb 2025


      https://bugs.winehq.org/show_bug.cgi?id=57817
Bug ID: 57817
           Summary: mvscp90 ::std::ifstream::seekg(0) crashes
           Product: Wine
           Version: 10.1
          Hardware: x86-64
                OS: FreeBSD
            Status: NEW
          Keywords: source, testcase
          Severity: normal
          Priority: P2
         Component: msvcp
          Assignee: wine-bugs@winehq.org
          Reporter: damjan.jov@gmail.com
Wine can be crashed as easily as calling seekg(0) on an ::std::ifstream when
linked with MSVCP90.DLL.
Sample crash code, compile it so it uses MSVCP90.DLL and run with any
"test.txt" in the current directory:
---snip---
#include <iostream>     // std::cout
#include <fstream>      // std::ifstream
int main (int argc, char **argv) {
  ::std::ifstream is ("test.txt", ::std::ifstream::binary);
  if (is) {
    // crashes:
    is.seekg(0);
    // doesn't crash:
    //is.seekg(0, ::std::ios::beg);
    return 0;
  } else
    return 1;
}
---snip---
On Windows it works, and on Wine with native MSVCP90.DLL and MSVCRT90.DLL it
works, but on Wine with builtin DLLs:
056c:Call
msvcp90.?seekg@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEAAV12@V?$fpos@H@2@@Z(0031fe38,00000000,0031fe38,000000000,00000000,00000001)
ret=1b001086
056c:Call msvcr90.memcpy(0031fd68,00000000,00000018) ret=7a023138
056c:trace:seh:dispatch_exception code=c0000005 (EXCEPTION_ACCESS_VIOLATION)
flags=0 addr=79F7F538
What's interesting is how calling is.seekg(0, ::std::ios::beg) instead works
perfectly on Wine with builtin DLLs.
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[Bug 57817] New: mvscp90 ::std::ifstream::seekg(0) crashes