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WSA_QOS_EPROVSPECBUF
ProviderSpecific length and object framing must describe the same byte sequence
WSA_QOS_EPROVSPECBUF means the provider-specific portion of the Winsock QOS structure is invalid as a whole. The member is a WSABUF, so both its pointer and byte count matter; the referenced bytes normally contain a chain of RSVP or traffic-control objects beginning with QOS_OBJECT_HDR.
Verify that the buffer remains alive for the entire call, its length does not include unrelated trailing storage, and every object fits before the declared end. A null pointer with a nonzero length, truncated header, missing end marker, or architecture-dependent serialization can all make the sequence unreadable. First test with an empty ProviderSpecific buffer and valid standard FLOWSPECs, then add objects one by one to identify the first malformed addition.
Buffer-level checks
- WSABUF pointer lifetime and length.
- First object alignment and header availability.
- Sum of all ObjectLength values.
- End-of-list marker and absence of trailing garbage.
References
- Microsoft: ProviderSpecific member of QOS
- Microsoft: provider-specific object sequence
- Microsoft: common QoS object format
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