diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 4de3186dc44e..3425098ef728 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1181,15 +1181,20 @@ int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
 			/* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
 			goto out_invalid_cdb_field;
 		}
-
+		/*
+		 * For the overflow case keep the existing fabric provided
+		 * ->data_length.  Otherwise for the underflow case, reset
+		 * ->data_length to the smaller SCSI expected data transfer
+		 * length.
+		 */
 		if (size > cmd->data_length) {
 			cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
 			cmd->residual_count = (size - cmd->data_length);
 		} else {
 			cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
 			cmd->residual_count = (cmd->data_length - size);
+			cmd->data_length = size;
 		}
-		cmd->data_length = size;
 	}
 
 	return 0;