[bug #25612] NSMatrix Segmentation Fault when clicking a cell

[Doug Simons]

URL:
  <http://savannah.gnu.org/bugs/?25612>

                 Summary: NSMatrix Segmentation Fault when clicking a cell
                 Project: GNUstep
            Submitted by: theeggcamefirst
            Submitted on: Tue 17 Feb 2009 07:18:17 PM GMT
                Category: Gui/AppKit
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I'm consistently getting a Segmentation fault when I click a field in a
matrix. Here's the backtrace:

#0  0xb7cef6ee in -[NSMatrix _selectCell:atRow:column:] (self=0x92d88c8,
_cmd=0xb7ec6b60, 
    aCell=0x92e17d8, row=0, column=0) at NSMatrix.m:1190
#1  0xb7cf3d09 in -[NSMatrix mouseDown:] (self=0x92d88c8, _cmd=0xb7f184d0,
theEvent=0x84f8a68)
    at NSMatrix.m:2518
#2  0xb7dc8533 in -[NSWindow sendEvent:] (self=0x92f3728, _cmd=0xb7e7e400,
theEvent=0x84f8a68)
    at NSWindow.m:3586
#3  0xb7c3278e in -[NSApplication sendEvent:] (self=0x842e428,
_cmd=0xb7e7e340, theEvent=0x84f8a68)
    at NSApplication.m:1951
#4  0xb7c3128a in -[NSApplication run] (self=0x842e428, _cmd=0xb7e73980) at
NSApplication.m:1455
#5  0xb7c12ec1 in NSApplicationMain (argc=1, argv=0xbfd5ae04) at
Functions.m:74
#6  0x0804fd32 in main (argc=1474660693, argv=0xec835356) at main.m:13

Line 1190 in NSMatrix.m looks like this:

    _selectedCells[_selectedRow][_selectedColumn] = NO;

Since both _selectedRow and _selectedColumn have a value of -1, I'm guessing
this is the cause of the crash. ;-)

I'm not sure what the correct change to the logic should be, but if I'm not
mistaken, it's pretty normal to have -1 for selected values when nothing is
selected. This interface was freshly loaded from a nib file with nothing
selected. Let me know if you need any more information. I'm running the latest
from svn (rev 27904).






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