[gdal-dev] Segmentation fault on BuildOverviews

[Even Rouault]

Jon,

thanks for the report. I've just pushed a fix for that

Even

> Hello all,
> 
> I think I've found an edge case in gdal.Dataset.BuildOverviews. I'm using
> GDAL 3.0.4 and have found that some of our BuildOverviews tests were
> crashing out with a seg fault. On investigation, it seems to be when
> COMPRESS_OVERVIEW is set to LZW, the height is greater than the width, and
> the overview list is long enough that we will end up with some 1x1
> overviews. Here is a code snippet that reproduces the crash.
> 
> from osgeo import gdal
> 
> gdal.SetConfigOption('COMPRESS_OVERVIEW', 'LZW')
> 
> temp_path = '/tmp/test.tif'
> drv = gdal.GetDriverByName('GTiff')
> raster_ds = drv.Create(temp_path, 5, 6, 1, gdal.GDT_Int16)
> del raster_ds
> 
> tif = gdal.OpenEx(temp_path, gdal.GA_ReadOnly)
> tif.BuildOverviews('nearest', overviewlist=[2, 4, 8])
> 
> 
> 
> The data type doesn't seem to matter (I've also tried Float32), but it seems
> that the raster dimensions are important. I couldn't get it to fail if the
> width was equal to or greater than the height.
> 
> Thanks,
> 
> Jon
> 
> Jon Morris
> Software Developer
> 
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