CVE-2024-40992

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.