Fix two potential SIGSEGV paths during early startup

- sentryintegration.cpp: sentry_options_new() can return nullptr on OOM;
  all subsequent sentry_options_set_* calls would immediately SIGSEGV.
  Guard with an early return that sets m_SentryErrorCode = -1 so Close()
  correctly skips sentry_close().

- zenserver.cpp: ZenServerState::Register() returns nullptr if the shared
  memory entry table is full. The subsequent Entry->SignalHasInstanceInfo(),
  Entry->SignalNoNetwork(), Entry->AddSponsorProcess(), and DoRun(Entry)
  calls would all SIGSEGV. Throw a descriptive runtime_error instead,
  which is caught by the existing catch handlers in Run().

2 files changed, 14 insertions, 0 deletions

diff --git a/src/zencore/sentryintegration.cpp b/src/zencore/sentryintegration.cpp
index 58b76783a..6b093f90b 100644
--- a/src/zencore/sentryintegration.cpp
+++ b/src/zencore/sentryintegration.cpp
@@ -246,6 +246,14 @@ SentryIntegration::Initialize(const Config& Conf, const std::string& CommandLine
 	}
 	sentry_options_t* SentryOptions = sentry_options_new();
 
+	if (SentryOptions == nullptr)
+	{
+		// OOM — skip sentry entirely rather than crashing on the subsequent set calls
+		m_SentryErrorCode = -1;
+		m_IsInitialized	  = true;
+		return;
+	}
+
 	sentry_options_set_dsn(SentryOptions, Conf.Dsn.empty() ? sentry::DefaultDsn.c_str() : Conf.Dsn.c_str());
 	sentry_options_set_database_path(SentryOptions, SentryDatabasePath.c_str());
 	sentry_options_set_logger(SentryOptions, SentryLogFunction, this);
diff --git a/src/zenserver/zenserver.cpp b/src/zenserver/zenserver.cpp
index 38cd5fc75..348e87740 100644
--- a/src/zenserver/zenserver.cpp
+++ b/src/zenserver/zenserver.cpp
@@ -730,6 +730,12 @@ ZenServerMain::Run()
 
 		Entry = ServerState.Register(m_ServerOptions.BasePort);
 
+		if (!Entry)
+		{
+			throw std::runtime_error(
+				fmt::format("Failed to register server on port {} in shared state (all slots occupied)", m_ServerOptions.BasePort));
+		}
+
 		if (m_ServerOptions.OwnerPid)
 		{
 			// We are adding a sponsor process to our own entry, can't wait for pick since the code is not run until later