Memory leak in kmlsuperoverlay

[Robert Coup]

Running gdal_translate over a vrt with

gdal_translate --config GDAL_CACHEMAX 128 -of kmlsuperoverlay -co RESAMPLE=CUBICSPLINE -co FORMAT=AUTO in.vrt out.kml

gdalinfo of the VRT & a source tile is attached.

memleax net output over 5 mins below. Don't have debug symbols on this one atm, but maybe it rings bells:

== 1000 memory blocks leaked at CallStack[2].
== Callstack statistics: (in ascending order)

CallStack[1]: may-leak=334 (26720 bytes)
    expired=334 (26720 bytes), free_expired=0 (0 bytes)
    alloc=57996 (4639680 bytes), free=2905 (232400 bytes)
    freed memory live time: min=33 max=42 average=38
    un-freed memory live time: max=301
    0x00007feac6d6ca80  libc-2.19.so  malloc()+0
    0x00007feac7327e3d  libstdc++.so  _ZnwmRKSt9nothrow_t()+29
    0x00007feac7f931c1  libgdal.so  _ZN26GDALAbstractBandBlockCache11CreateBlockEi()+129
    0x00007feac7fdeee2  libgdal.so  _ZN14GDALRasterBand17GetLockedBlockRefEiii()+130
    0x00007feac7ffa139  libgdal.so  _ZN14GDALRasterBand9IRasterIOE10GDALRWFlagiiii()+2505
    0x00007feac7c8a5ab  libgdal.so  _ZN15GTiffRasterBand9IRasterIOE10GDALRWFlagiii()+235
    0x00007feac7fd91ca  libgdal.so  _ZN19GDALProxyRasterBand9IRasterIOE10GDALRWFla()+330
    0x00007feac7fdead7  libgdal.so  _ZN14GDALRasterBand8RasterIOE10GDALRWFlagiiiiP()+951
    0x00007feac7f51e08  libgdal.so  _ZN15VRTSimpleSource8RasterIOEiiiiPvii12GDALDa()+680
    0x00007feac7f4c0c6  libgdal.so  _ZN20VRTSourcedRasterBand9IRasterIOE10GDALRWFl()+374
    0x00007feac7fdead7  libgdal.so  _ZN14GDALRasterBand8RasterIOE10GDALRWFlagiiiiP()+951
    0x00007feac7d7a639  libgdal.so  _ZN26KmlSuperOverlayReadDataset18DetectTranspa()+585
    0x00007feac7d80b40  libgdal.so
    0x00007feac7fb33ee  libgdal.so  _ZN10GDALDriver10CreateCopyEPKcP11GDALDataseti()+510
    0x00007feac7b39d79  libgdal.so  GDALTranslate()+13993
    0x00000000004019f0  gdal_translate
    0x00007feac6d0bf45  libc-2.19.so  __libc_start_main()+245
    0x00000000004020bc  gdal_translate

CallStack[2]: may-leak=1000 (80000 bytes)
    expired=1000 (80000 bytes), free_expired=0 (0 bytes)
    alloc=176495 (14119600 bytes), free=2786 (222880 bytes)
    freed memory live time: min=39 max=46 average=42
    un-freed memory live time: max=301
    0x00007feac6d6ca80  libc-2.19.so  malloc()+0
    0x00007feac7327e3d  libstdc++.so  _ZnwmRKSt9nothrow_t()+29
    0x00007feac7f931c1  libgdal.so  _ZN26GDALAbstractBandBlockCache11CreateBlockEi()+129
    0x00007feac7fdeee2  libgdal.so  _ZN14GDALRasterBand17GetLockedBlockRefEiii()+130
    0x00007feac7c79474  libgdal.so  _ZN15GTiffRasterBand22FillCacheForOtherBandsEi()+164
    0x00007feac7c872e3  libgdal.so  _ZN15GTiffRasterBand10IReadBlockEiiPv()+627
    0x00007feac7fdef7c  libgdal.so  _ZN14GDALRasterBand17GetLockedBlockRefEiii()+284
    0x00007feac7ffa139  libgdal.so  _ZN14GDALRasterBand9IRasterIOE10GDALRWFlagiiii()+2505
    0x00007feac7c8a5ab  libgdal.so  _ZN15GTiffRasterBand9IRasterIOE10GDALRWFlagiii()+235
    0x00007feac7fd91ca  libgdal.so  _ZN19GDALProxyRasterBand9IRasterIOE10GDALRWFla()+330
    0x00007feac7fdead7  libgdal.so  _ZN14GDALRasterBand8RasterIOE10GDALRWFlagiiiiP()+951
    0x00007feac7f51e08  libgdal.so  _ZN15VRTSimpleSource8RasterIOEiiiiPvii12GDALDa()+680
    0x00007feac7f4c0c6  libgdal.so  _ZN20VRTSourcedRasterBand9IRasterIOE10GDALRWFl()+374
    0x00007feac7fdead7  libgdal.so  _ZN14GDALRasterBand8RasterIOE10GDALRWFlagiiiiP()+951
    0x00007feac7d7a639  libgdal.so  _ZN26KmlSuperOverlayReadDataset18DetectTranspa()+585
    0x00007feac7d80b40  libgdal.so
    0x00007feac7fb33ee  libgdal.so  _ZN10GDALDriver10CreateCopyEPKcP11GDALDataseti()+510
    0x00007feac7b39d79  libgdal.so  GDALTranslate()+13993
    0x00000000004019f0  gdal_translate
    0x00007feac6d0bf45  libc-2.19.so  __libc_start_main()+245
    0x00000000004020bc  gdal_translate