kernel: fix Z(6,3) segfaulting

gap-system · Dec 21, 2016 · d3baa77 · d3baa77
1 parent a8ddedb
commit d3baa77
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diff --git a/src/finfield.c b/src/finfield.c
@@ -1928,7 +1928,10 @@ Obj FuncZ2 ( Obj self, Obj p, Obj d)
             {
               /* get the finite field                                                */
               ff = FiniteField( ip, id );
-
+
+              if (ff == 0)
+                ErrorMayQuit("Z: <q> must be a positive prime power", 0, 0);
+
               /* make the root                                                       */
               return NEW_FFE( ff, (ip == 2 && id == 1 ? 1 : 2) );
             }

diff --git a/tst/teststandard/bugfix.tst b/tst/teststandard/bugfix.tst
@@ -3152,6 +3152,10 @@ gap> Length(oe.vectors); Length(oe.solutions);
 159
 0
 
+# 2016/12/20 (MH)
+gap> Z(6,3);
+Error, Z: <q> must be a positive prime power
+
 #############################################################################
 gap> STOP_TEST( "bugfix.tst", 831990000);