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-rw-r--r--src/expression.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/expression.c b/src/expression.c
index 9c9a7ced..deb649e1 100644
--- a/src/expression.c
+++ b/src/expression.c
@@ -1465,6 +1465,7 @@ void range_expr_value_high(mpz_t rop, const struct expr *expr)
return mpz_set(rop, expr->value);
case EXPR_PREFIX:
range_expr_value_low(rop, expr->prefix);
+ assert(expr->len >= expr->prefix_len);
mpz_init_bitmask(tmp, expr->len - expr->prefix_len);
mpz_add(rop, rop, tmp);
mpz_clear(tmp);