fixes

Author: abenso

fuzzing/fuzz_local/zxformat_fuzzer.cpp

@@ -120,7 +120,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     // Test bip32_to_str
     if (size >= 20) {
         char bip32Buffer[256];
-        uint32_t path[5];
+        uint32_t path[6];
         const uint8_t pathLen = (data[0] % 5) + 1;
 
         // Initialize all path elements to 0
@@ -247,10 +247,12 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
         // Test with non-ASCII data
         uint8_t nonAsciiData[64];
-        for (size_t i = 0; i < 64 && i < size; i++) {
+        memset(nonAsciiData, 0x80, sizeof(nonAsciiData));
+        const size_t naCopy = size < sizeof(nonAsciiData) ? size : sizeof(nonAsciiData);
+        for (size_t i = 0; i < naCopy; i++) {
             nonAsciiData[i] = data[i] | 0x80;
         }
-        formatBufferData(nonAsciiData, 64, formattedOutput, outputLen, pageIdx, &pageCount);
+        formatBufferData(nonAsciiData, naCopy, formattedOutput, outputLen, pageIdx, &pageCount);
     }
 
     // Test uint64_from_BEarray