svcrdma: Reject inline replies that overflow the pull-up buffer

index 7f6d17bf8c1f..c09659b17351 100644
@@ -825,20 +825,21 @@ static int svc_rdma_xb_count_sges(const struct xdr_buf *xdr,
 }
 
 /**
- * svc_rdma_pull_up_needed - Determine whether to use pull-up
+ * svc_rdma_check_pull_up - Determine whether to use pull-up
  * @rdma: controlling transport
  * @sctxt: send_ctxt for the Send WR
  * @write_pcl: Write chunk list provided by client
  * @xdr: xdr_buf containing RPC message to transmit
  *
  * Returns:
- *   %true if pull-up must be used
- *   %false otherwise
+ *   %1 if pull-up must be used
+ *   %0 if pull-up is not needed
+ *   %-E2BIG if the reply is too large to be pulled up
  */
-static bool svc_rdma_pull_up_needed(const struct svcxprt_rdma *rdma,
-				    const struct svc_rdma_send_ctxt *sctxt,
-				    const struct svc_rdma_pcl *write_pcl,
-				    const struct xdr_buf *xdr)
+static int svc_rdma_check_pull_up(const struct svcxprt_rdma *rdma,
+				   const struct svc_rdma_send_ctxt *sctxt,
+				   const struct svc_rdma_pcl *write_pcl,
+				   const struct xdr_buf *xdr)
 {
 	/* Resources needed for the transport header */
 	struct svc_rdma_pullup_data args = {

@@ -850,11 +851,22 @@ static bool svc_rdma_pull_up_needed(const struct svcxprt_rdma *rdma,
 	ret = pcl_process_nonpayloads(write_pcl, xdr,
 				      svc_rdma_xb_count_sges, &args);
 	if (ret < 0)
-		return false;
+		return 0;
 
 	if (args.pd_length < RPCRDMA_PULLUP_THRESH)
-		return true;
-	return args.pd_num_sges >= rdma->sc_max_send_sges;
+		return 1;
+	if (args.pd_num_sges < rdma->sc_max_send_sges)
+		return 0;
+
+	/*
+	 * The reply has too many SGEs to Send inline, so it has to be
+	 * linearized into sc_xprt_buf. That buffer holds only
+	 * sc_max_req_size bytes, so a larger reply cannot be pulled up.
+	 * RFC 8166 Section 4.5.3 requires responding with ERR_CHUNK.
+	 */
+	if (args.pd_length > rdma->sc_max_req_size)
+		return -E2BIG;
+	return 1;
 }
 
 /**

@@ -910,7 +922,7 @@ static int svc_rdma_xb_linearize(const struct xdr_buf *xdr,
  * Assemble the elements of @xdr into the transport header buffer.
  *
  * Assumptions:
- *  pull_up_needed has determined that @xdr will fit in the buffer.
+ *  check_pull_up has determined that @xdr will fit in the buffer.
  *
  * Returns:
  *   %0 if pull-up was successful

@@ -945,6 +957,7 @@ static int svc_rdma_pull_up_reply_msg(const struct svcxprt_rdma *rdma,
  *
  * Returns:
  *   %0 if DMA mapping was successful.
+ *   %-E2BIG if the reply is too large to be pulled up
  *   %-EMSGSIZE if a buffer manipulation problem occurred
  *   %-EIO if DMA mapping failed
  *

@@ -960,6 +973,7 @@ int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
 		.md_rdma	= rdma,
 		.md_ctxt	= sctxt,
 	};
+	int ret;
 
 	/* Set up the (persistently-mapped) transport header SGE. */
 	sctxt->sc_send_wr.num_sge = 1;

@@ -974,7 +988,10 @@ int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
 	/* For pull-up, svc_rdma_send() will sync the transport header.
 	 * No additional DMA mapping is necessary.
 	 */
-	if (svc_rdma_pull_up_needed(rdma, sctxt, write_pcl, xdr))
+	ret = svc_rdma_check_pull_up(rdma, sctxt, write_pcl, xdr);
+	if (ret < 0)
+		return ret;
+	if (ret)
 		return svc_rdma_pull_up_reply_msg(rdma, sctxt, write_pcl, xdr);
 
 	return pcl_process_nonpayloads(write_pcl, xdr,

@@ -1162,7 +1179,7 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 						   &rctxt->rc_reply_pcl, sctxt,
 						   &rqstp->rq_res);
 		if (ret < 0)
-			goto reply_chunk;
+			goto send_err;
 		rc_size = ret;
 	}
 

@@ -1183,10 +1200,10 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 
 	ret = svc_rdma_send_reply_msg(rdma, sctxt, rctxt, rqstp);
 	if (ret < 0)
-		goto put_ctxt;
+		goto send_err;
 	return 0;
 
-reply_chunk:
+send_err:
 	if (ret != -E2BIG && ret != -EINVAL)
 		goto put_ctxt;