[Bug 38392] New: Divide by zero in dlls/user32/Edit.c source file

https://bugs.winehq.org/show_bug.cgi?id=38392

            Bug ID: 38392
           Summary: Divide by zero in dlls/user32/Edit.c  source file
           Product: Wine
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: wine-bugs(a)winehq.org
          Reporter: bur_av(a)bk.ru
      Distribution: ---

Upon calculation of line count in get_vertical_line_count function, line_height
field might take value of 0, which results in division by zero error. E.g. I
encountered this when dynamically creating hidden text control in Clarion
language, which uses WinAPI call for that.

Here's my hotfix for this bug (return 1 if es->line_height <= 0):

{{{
static inline INT get_vertical_line_count(EDITSTATE *es) {
  if (es->line_height <=0) {
    return 1;
  }
  else {
    INT vlc = (es->format_rect.bottom - es->format_rect.top) / es->line_height;
    return max(1,vlc);
  }
}
}}}

The problem shows up in WINE versions 1.4.1 - 1.7.40. (at least on CentOS 6,
CentOS 7, Debian 7 and Mint 17).

Please, fix this bug in official release.

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[Bug 38392] Divide by zero in dlls/user32/Edit.c source file

https://bugs.winehq.org/show_bug.cgi?id=38392

nallekarhu_80(a)luukku.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nallekarhu_80(a)luukku.com

--- Comment #1 from nallekarhu_80(a)luukku.com ---
Can you figure any test application for this?

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[Bug 38392] Divide by zero in dlls/user32/Edit.c source file (encountered with Clarion TX Control wrapper)

https://bugs.winehq.org/show_bug.cgi?id=38392

Anastasius Focht <focht(a)gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |focht(a)gmx.net
            Version|unspecified                 |1.4.1
         Resolution|---                         |DUPLICATE
            Summary|Divide by zero in           |Divide by zero in
                   |dlls/user32/Edit.c  source  |dlls/user32/Edit.c source
                   |file                        |file (encountered with
                   |                            |Clarion TX Control wrapper)

--- Comment #2 from Anastasius Focht <focht(a)gmx.net> ---
Hello folks,

dupe of bug 19239

Also try to put at least the application name and version to reproduce with in
the bug summary.

Regards

*** This bug has been marked as a duplicate of bug 19239 ***

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[Bug 38392] Divide by zero in dlls/user32/Edit.c source file (encountered with Clarion TX Control wrapper)

https://bugs.winehq.org/show_bug.cgi?id=38392

Austin English <austinenglish(a)gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #3 from Austin English <austinenglish(a)gmail.com> ---
Closing.

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