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[Fix] (MG_Remote, Wire): let an encoder caller omit a tail whose own count is zero - Count == 0 is a legal record for every kVarTail row and a required placeholder entry would be a trap

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swung0x48
2026-09-11 13:59:51 -04:00
parent 1af5e31f3b
commit 91d0c6b06f
2 changed files with 32 additions and 5 deletions
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MobileGL/MG_Remote/Wire/PipeWireCodec.cpp
+11 -5
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@@ -672,14 +672,20 @@ namespace MobileGL::MG_Remote::Wire {
// The caller's tails are held to the layout the PAYLOAD declares, which is the same
// arithmetic the decoder will run. A Count that says 4000 while the tail holds 8 bytes
// dies here, on the producing side, rather than on a peer that can only say "corrupt".
if (tailCount != layout.TailCount) {
//
// A caller may SUPPLY FEWER TAILS THAN THE LAYOUT HAS, but only while the ones it left
// out are empty - Count == 0 is a legal record for every kVarTail row, and requiring a
// {nullptr, 0} entry for it would be a trap rather than a check. Anything else is a
// disagreement between the counts the payload declares and the bytes the caller holds.
if (tailCount > layout.TailCount) {
WireProtocolFatalAt("EncodeRecord.tailCount", tailCount, layout.TailCount);
}
for (Uint32 i = 0; i < tailCount; ++i) {
if (tails[i].Size != layout.TailBytes[i]) {
WireProtocolFatalAt("EncodeRecord.tailBytes", tails[i].Size, layout.TailBytes[i]);
for (Uint32 i = 0; i < layout.TailCount; ++i) {
const Uint64 supplied = i < tailCount ? tails[i].Size : 0;
if (supplied != layout.TailBytes[i]) {
WireProtocolFatalAt("EncodeRecord.tailBytes", supplied, layout.TailBytes[i]);
}
if (tails[i].Size != 0 && tails[i].Bytes == nullptr) {
if (supplied != 0 && tails[i].Bytes == nullptr) {
WireProtocolFatal("EncodeRecord.tail", "non-zero tail length with a null pointer");
}
}