evaluate: reject unsupported expressions in payload statement for bitfields

The payload statement evaluation pretends that it can handle any
expression for bitfields, but the existing evaluation code only knows
how to handle value expression.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/src/evaluate.c b/src/evaluate.c
index c090aebe2cca87d9a5da5ff8c7e394a7e73a60ca..d7915ed19d59bc60602b3acd71a155515385a3f5 100644 (file)
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -3351,7 +3351,8 @@ static int stmt_evaluate_payload(struct eval_ctx *ctx, struct stmt *stmt)
                        mpz_lshift_ui(stmt->payload.val->value, shift_imm);
                break;
        default:
-               break;
+               return expr_error(ctx->msgs, stmt->payload.val,
+                                 "payload statement for this expression is not supported");
        }
 
        masklen = payload_byte_size * BITS_PER_BYTE;