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SPDM - enhance the payload size check upon receiving #616

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Merged
merged 1 commit into from
Nov 24, 2025
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SPDM - enhance the payload size check upon receiving #616

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6 changes: 5 additions & 1 deletion src/migtd/src/spdm/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,10 @@ impl<T: AsyncRead + AsyncWrite + Unpin> SpdmDeviceIo for MigtdTransport<T> {
_timeout: usize,
) -> Result<usize, usize> {
let mut buffer = buffer.lock();
if buffer.len() < VMCALL_SPDM_MESSAGE_HEADER_SIZE {
return Err(0_usize);
}

let mut recvd = 0;
while recvd < VMCALL_SPDM_MESSAGE_HEADER_SIZE {
let n = self
Expand All @@ -78,7 +82,7 @@ impl<T: AsyncRead + AsyncWrite + Unpin> SpdmDeviceIo for MigtdTransport<T> {
vmcall_msg::VmCallMessageHeader::read(&mut reader).ok_or(0_usize)?;
let payload_size = vmcall_msg_header.length as usize;

if buffer.len() < payload_size + VMCALL_SPDM_MESSAGE_HEADER_SIZE {
if payload_size > buffer.len().saturating_sub(VMCALL_SPDM_MESSAGE_HEADER_SIZE) {
return Err(0_usize);
}

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