RDMA/rxe: Fix responder length checking for UD request packets

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix responder length checking for UD request packets According to the IBA specification: If a UD request packet is detected with an invalid length, the request shall be an invalid request and it shall be silently dropped by the responder. The responder then waits for a new request packet. commit 689c5421bfe0 ("RDMA/rxe: Fix incorrect responder length checking") defers responder length check for UD QPs in function `copy_data`. But it introduces a regression issue for UD QPs. When the packet size is too large to fit in the receive buffer. `copy_data` will return error code -EINVAL. Then `send_data_in` will return RESPST_ERR_MALFORMED_WQE. UD QP will transfer into ERROR state.

References

• https://git.kernel.org/stable/c/163868ec1f6c610d16da9e458fe1dd7d5de97341
• https://git.kernel.org/stable/c/943c94f41dfe36536dc9aaa12c9efdf548ceb996
• https://git.kernel.org/stable/c/f67ac0061c7614c1548963d3ef1ee1606efd8636