diff options
| -rw-r--r-- | testing/libfuzzer/xfa_codec_fuzzer.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/testing/libfuzzer/xfa_codec_fuzzer.h b/testing/libfuzzer/xfa_codec_fuzzer.h index 6a84ed8572..13a467e1ef 100644 --- a/testing/libfuzzer/xfa_codec_fuzzer.h +++ b/testing/libfuzzer/xfa_codec_fuzzer.h @@ -49,8 +49,13 @@ class XFACodecFuzzer { void Release() override {} FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override { + if (offset < 0 || offset >= m_size) + return FALSE; if (offset + size > m_size) size = m_size - offset; + if (size == 0) + return FALSE; + memcpy(buffer, m_data + offset, size); return TRUE; } |