bugXBoard - Bugs: bug #45775, infinite looping in...


bug #45775: infinite looping in CreatePNGBoard()

Submitter:  Matt Day <fjarlq>
Submitted:  Sun 16 Aug 2015 11:57:20 PM UTC
Category:  None Severity:  3 - Normal
Item Group:  Crash Status:  Fixed
Assigned to:  None Open/Closed:  Closed
Release:  None
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Sat 15 May 2021 05:12:27 AM UTC, comment #1: 

H.G. fixed this bug with git commit 713f3a53e.

Tim Mann <mann>
Project Administrator
Sun 16 Aug 2015 11:57:20 PM UTC, original submission:  

If draw.c's CreatePNGBoard() is called with a file that doesn't exist, it fails to notice the error and then gets stuck in an infinite loop.

I had a liteBackTextureFile defined in my $HOME/.xboardrc that referred to a file that no longer exists. So, a workaround is to delete the old liteBackTextureFile and darkBackTextureFile definitions from my $HOME/.xboardrc.

CreatePNGBoard is calling cairo_image_surface_create_from_png() but then only checking that the return value is nonzero. It should actually be checking that cairo_surface_status(img) == CAIRO_STATUS_SUCCESS.

See attached patch.

The infinite loop is due to the 'w' and 'h' variables being equal to zero, while squareSize is positive, so it gets stuck in this loop:

    while(squareSize > n[kind]*w || squareSize > n[kind]*h) n[kind]++;

Matt Day <fjarlq>


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Attach Files:

Attached Files
file #34664:  xboard-img.diff added by fjarlq (504B - application/octet-stream)


Depends on the following items: None found

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-05-15 mann StatusNone Fixed
        Open/ClosedOpen Closed
    2015-08-16 fjarlq Attached File- Added xboard-img.diff, #34664

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