File CVE-2020-15900.patch of Package ghostscript.15866

--- psi/zstring.c.orig	2020-03-19 09:21:42.000000000 +0100
+++ psi/zstring.c	2020-07-27 08:25:08.963425295 +0200
@@ -142,13 +142,18 @@ search_impl(i_ctx_t *i_ctx_p, bool forwa
     return 0;
 found:
     op->tas.type_attrs = op1->tas.type_attrs;
-    op->value.bytes = ptr;
-    r_set_size(op, size);
+    op->value.bytes = ptr;				/* match */
+    op->tas.rsize = size;				/* match */
     push(2);
-    op[-1] = *op1;
-    r_set_size(op - 1, ptr - op[-1].value.bytes);
-    op1->value.bytes = ptr + size;
-    r_set_size(op1, count + (!forward ? (size - 1) : 0));
+    op[-1] = *op1;					/* pre */
+    op[-3].value.bytes = ptr + size;			/* post */
+    if (forward) {
+        op[-1].tas.rsize = ptr - op[-1].value.bytes;	/* pre */
+        op[-3].tas.rsize = count;			/* post */
+    } else {
+        op[-1].tas.rsize = count;			/* pre */
+        op[-3].tas.rsize -= count + size;		/* post */
+    }
     make_true(op);
     return 0;
 }
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