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-rw-r--r--libs/binder/RpcSession.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/libs/binder/RpcSession.cpp b/libs/binder/RpcSession.cpp
index 90ce4d6d3f..254b99c29a 100644
--- a/libs/binder/RpcSession.cpp
+++ b/libs/binder/RpcSession.cpp
@@ -87,6 +87,12 @@ bool RpcSession::setProtocolVersion(uint32_t version) {
}
std::lock_guard<std::mutex> _l(mMutex);
+ if (mProtocolVersion && version > *mProtocolVersion) {
+ ALOGE("Cannot upgrade explicitly capped protocol version %u to newer version %u",
+ *mProtocolVersion, version);
+ return false;
+ }
+
mProtocolVersion = version;
return true;
}