Let's analyze the code step by step to understand the CWE-190 (Integer Overflow or Wraparound) vulnerability:

1. Input:
   - The function takes several parameters, including `CDRMessage_t* msg` and `SubmessageHeader_t* smh`.
   - `smh->submessageLength` is used in the calculation of `payload_size`.

2. Initial checks:
   - The code checks if `smh->submessageLength` is less than `RTPSMESSAGE_DATA_MIN_LENGTH` (line 10).
   - This check prevents very small submessage lengths but doesn't guard against large values.

3. Vulnerable calculation (line 108):
   ```c++
   payload_size = smh->submessageLength -
           (RTPSMESSAGE_DATA_EXTRA_INLINEQOS_SIZE + octetsToInlineQos + inlineQosSize);
   ```

4. Potential for integer overflow:
   - `smh->submessageLength` is likely an unsigned integer.
   - If `smh->submessageLength` is smaller than the sum of the subtracted values, it will cause an integer underflow.
   - This underflow will result in `payload_size` becoming a very large number due to wraparound.

5. Consequences:
   - The large `payload_size` is used in subsequent operations:
     - It's compared against `msg->length` (line 114).
     - It's used to set `ch.serializedPayload.length` and `ch.serializedPayload.max_size` (lines 117-118).
   - If `payload_size` is very large due to underflow, it might pass the check on line 114 but lead to buffer overflow when used for memory operations.

6. Lack of proper bounds checking:
   - There's no upper bound check on `smh->submessageLength` or the resulting `payload_size`.
   - The code assumes that the subtraction will always result in a valid, non-negative value.

Conclusion:
The vulnerability occurs because the code doesn't account for the possibility of integer underflow in the calculation of `payload_size`. If `smh->submessageLength` is smaller than the sum of subtracted values, it will cause an underflow, resulting in a very large `payload_size`. This large value could then be used in memory operations, potentially leading to buffer overflows or other memory corruption issues.

To fix this, the code should include checks to ensure that `smh->submessageLength` is large enough to prevent underflow, and also implement an upper bound check on the resulting `payload_size` to prevent potential buffer overflows in subsequent operations.