diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 828697015759..8cdea25f1377 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1568,9 +1568,11 @@ iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 {
 	struct kvec *iov;
 	u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
-	u32 payload_length = ntoh24(hdr->dlength);
+	u32 payload_length;
 	int iov_ret, data_crc_failed = 0;
 
+	payload_length = min_t(u32, cmd->se_cmd.data_length,
+			       ntoh24(hdr->dlength));
 	rx_size += payload_length;
 	iov = &cmd->iov_data[0];
 
@@ -2575,14 +2577,33 @@ static int iscsit_handle_immediate_data(
 	u32 checksum, iov_count = 0, padding = 0;
 	struct iscsi_conn *conn = cmd->conn;
 	struct kvec *iov;
+	void *overflow_buf = NULL;
 
-	iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
+	BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
+	rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
+	iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done,
+				   rx_size);
 	if (iov_ret < 0)
 		return IMMEDIATE_DATA_CANNOT_RECOVER;
 
-	rx_size = length;
 	iov_count = iov_ret;
 	iov = &cmd->iov_data[0];
+	if (rx_size < length) {
+		/*
+		 * Special case: length of immediate data exceeds the data
+		 * buffer size derived from the CDB.
+		 */
+		overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
+		if (!overflow_buf) {
+			iscsit_unmap_iovec(cmd);
+			return IMMEDIATE_DATA_CANNOT_RECOVER;
+		}
+		cmd->overflow_buf = overflow_buf;
+		iov[iov_count].iov_base = overflow_buf;
+		iov[iov_count].iov_len = length - rx_size;
+		iov_count++;
+		rx_size = length;
+	}
 
 	padding = ((-length) & 3);
 	if (padding != 0) {
diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index 5b26bc23016a..fae85bfd790e 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -737,6 +737,7 @@ void iscsit_release_cmd(struct iscsi_cmd *cmd)
 	kfree(cmd->pdu_list);
 	kfree(cmd->seq_list);
 	kfree(cmd->tmr_req);
+	kfree(cmd->overflow_buf);
 	kfree(cmd->iov_data);
 	kfree(cmd->text_in_ptr);
 
diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h
index 24c398f4a68f..a49d37140a64 100644
--- a/include/target/iscsi/iscsi_target_core.h
+++ b/include/target/iscsi/iscsi_target_core.h
@@ -473,6 +473,7 @@ struct iscsi_cmd {
 	struct timer_list	dataout_timer;
 	/* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
 	struct kvec		*iov_data;
+	void			*overflow_buf;
 	/* Iovecs for miscellaneous purposes */
 #define ISCSI_MISC_IOVECS			5
 	struct kvec		iov_misc[ISCSI_MISC_IOVECS];