[gdal-dev] OGRFree(pszSrcWKT) can crash Matlab

[Chaitanya kumar CH]

 Joaquim,

I understand that printing the contents of pszSrcWKT gave different results
before and after the call to GDALClose( hSrcDS ).
There seems to be some code you left in the mail. Can you paste the
neighbouring code at http://pastebin.ca ?

On Sat, Jan 23, 2010 at 8:34 PM, <jluis at ualg.pt> wrote:

> Hi,
>
> I have a serious crash in one of my Matlab MEXs caused by a call to
> OGRFree() with an argument of size one (possibly the  null terminator).
> This happens on OSX SL (64 bits) but not on Windows (where I still build at
> 32 bits)
>
> Here is, as far as I could trace it, what is happening (SVN version of the
> same age as GDAL1.7RC1)
>
> mexPrintf("---- %s\n%s\n", pszSrcWKT,pszDstWKT);
>
> That prints
>
> ---- GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS
> 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"]]
> PROJCS["UTM Zone 29, Northern Hemisphere",GEOGCS["WGS
> 84",DATUM["WGS_1984",SPHEROID["WGS
> 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-9],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]
>
>
> Next the code does:
>
>        GDALClose( hSrcDS );
> mexPrintf("---- %s\n%s\n", pszSrcWKT,pszDstWKT);
>
> and now pszSrcWKT is empty. See
>
> ---- PROJCS["UTM Zone 29, Northern Hemisphere",GEOGCS["WGS
> 84",DATUM["WGS_1984",SPHEROID["WGS
> 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-9],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]
>
> If I make it print the size of pszSrcWKT  with strlen(pszSrcWKT) the answer
> is 1 and finally the MEX (and the entire MATLAB) crash on the call
>
> OGRFree(pszSrcWKT);
>
>
> Joaquim Luis
>
> ----------------------------------------------------------------
> This message was sent using IMP, the Internet Messaging Program.
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>



-- 
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9848167848
17.241582N 80.142635E
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/gdal-dev/attachments/20100123/d9090bf5/attachment.html