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Fix 16-bit string length desync on offset recovery

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The decoder recovered offset-encoded 16-bit string lengths into a
uint16_t, so sz += ProtocolOffset8Bit truncated lengths in [65536,
65791] back into [0, 255] in release builds, desynchronizing the
stream. Read the wire value into uint16_t sz16 and recover into a
uint32_t sz, relying on automatic promotion for the addition.

Align the client asserts with the encoder's actual capacity
(ProtocolOffset8Bit + uint16 max).
This commit is contained in:
Bartosz Taudul
2026-08-13 18:10:43 +02:00
parent 821d43c6b5
commit edc09a4e97
2 changed files with 18 additions and 18 deletions
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30
server/TracyWorker.cpp
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@@ -3191,22 +3191,23 @@ void Worker::DispatchFailure( const QueueItem& ev, const char*& ptr )
else
{
uint8_t sz8;
uint16_t sz;
uint16_t sz16;
uint32_t sz;
switch( ev.hdr.type )
{
case QueueType::SingleStringData:
ptr += sizeof( QueueHeader );
memcpy( &sz, ptr, sizeof( sz ) );
ptr += sizeof( sz );
sz += ProtocolOffset8Bit;
memcpy( &sz16, ptr, sizeof( sz16 ) );
ptr += sizeof( sz16 );
sz = sz16 + ProtocolOffset8Bit;
AddSingleStringFailure( ptr, sz );
ptr += sz;
break;
case QueueType::SecondStringData:
ptr += sizeof( QueueHeader );
memcpy( &sz, ptr, sizeof( sz ) );
ptr += sizeof( sz );
sz += ProtocolOffset8Bit;
memcpy( &sz16, ptr, sizeof( sz16 ) );
ptr += sizeof( sz16 );
sz = sz16 + ProtocolOffset8Bit;
AddSecondString( ptr, sz );
ptr += sz;
break;
@@ -3408,22 +3409,23 @@ bool Worker::DispatchProcess( const QueueItem& ev, const char*& ptr )
else
{
uint8_t sz8;
uint16_t sz;
uint16_t sz16;
uint32_t sz;
switch( ev.hdr.type )
{
case QueueType::SingleStringData:
ptr += sizeof( QueueHeader );
memcpy( &sz, ptr, sizeof( sz ) );
ptr += sizeof( sz );
sz += ProtocolOffset8Bit;
memcpy( &sz16, ptr, sizeof( sz16 ) );
ptr += sizeof( sz16 );
sz = sz16 + ProtocolOffset8Bit;
AddSingleString( ptr, sz );
ptr += sz;
return true;
case QueueType::SecondStringData:
ptr += sizeof( QueueHeader );
memcpy( &sz, ptr, sizeof( sz ) );
ptr += sizeof( sz );
sz += ProtocolOffset8Bit;
memcpy( &sz16, ptr, sizeof( sz16 ) );
ptr += sizeof( sz16 );
sz = sz16 + ProtocolOffset8Bit;
AddSecondString( ptr, sz );
ptr += sz;
return true;