1 files changed, 2 insertions, 2 deletions
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index c75f0365f5..485869e535 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -1797,8 +1797,8 @@ status_t Parcel::readUtf8FromUtf16(std::unique_ptr<std::string>* str) const {
 
 const char* Parcel::readCString() const
 {
-    const size_t avail = mDataSize-mDataPos;
-    if (avail > 0) {
+    if (mDataPos < mDataSize) {
+        const size_t avail = mDataSize-mDataPos;
         const char* str = reinterpret_cast<const char*>(mData+mDataPos);
         // is the string's trailing NUL within the parcel's valid bounds?
         const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));