Avoid SIGFPE due to modulo-by-zero is the requested number of significant

figures is greater than log10(2^63).
BP


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@14512 57a11ea4-9604-0410-9ed3-97b8803252fd

lib/libqof/qof/gnc-numeric.c

@@ -785,6 +785,9 @@ gnc_numeric_convert(gnc_numeric in, gint64 denom, gint how)
       }
       sigfigs  = GNC_HOW_GET_SIGFIGS(how);
 
+      if (fabs(sigfigs - logratio) > 18)
+          return gnc_numeric_error(GNC_ERROR_OVERFLOW);
+
       if(sigfigs-logratio >= 0) {
         denom    = (gint64)(pow(10, sigfigs-logratio));
       }