File tiff-CVE-2022-0561,CVE-2022-34266.patch of Package tiff.26987

Index: tiff-4.0.9/libtiff/tif_dirread.c
===================================================================
--- tiff-4.0.9.orig/libtiff/tif_dirread.c
+++ tiff-4.0.9/libtiff/tif_dirread.c
@@ -5633,8 +5633,9 @@ TIFFFetchStripThing(TIFF* tif, TIFFDirEn
 			_TIFFfree(data);
 			return(0);
 		}
-                _TIFFmemcpy(resizeddata,data,(uint32)dir->tdir_count*sizeof(uint64));
-                _TIFFmemset(resizeddata+(uint32)dir->tdir_count,0,(nstrips-(uint32)dir->tdir_count)*sizeof(uint64));
+		if( dir->tdir_count )
+			_TIFFmemcpy(resizeddata,data, (uint32)dir->tdir_count * sizeof(uint64));
+		_TIFFmemset(resizeddata+(uint32)dir->tdir_count, 0, (nstrips - (uint32)dir->tdir_count) * sizeof(uint64));
 		_TIFFfree(data);
 		data=resizeddata;
 	}