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EstimateStripByteCounts(): avoid unsigned integer overflow

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Even Rouault 2019-08-22 10:19:44 +02:00
parent 761d50e34d
commit c8f268ef1b
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1 changed files with 2 additions and 0 deletions
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libtiff/tif_dirread.c
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@ -4549,6 +4549,8 @@ EstimateStripByteCounts(TIFF* tif, TIFFDirEntry* dir, uint16 dircount)
dp->tdir_type); dp->tdir_type);
return -1; return -1;
} }
if( dp->tdir_count > TIFF_UINT64_MAX / typewidth )
return -1;
datasize=(uint64)typewidth*dp->tdir_count; datasize=(uint64)typewidth*dp->tdir_count;
if (!(tif->tif_flags&TIFF_BIGTIFF)) if (!(tif->tif_flags&TIFF_BIGTIFF))
{ {