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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "net/http/http_chunked_decoder.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <vector>
#include "base/containers/to_vector.h"
// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data_ptr, size_t size) {
// SAFETY: libfuzzer provides a valid pointer and size pair.
auto data = UNSAFE_BUFFERS(base::span(data_ptr, size));
net::HttpChunkedDecoder decoder;
// Feed data to decoder.FilterBuf() by blocks of "random" size.
size_t block_size = 0;
for (size_t offset = 0; offset < size; offset += block_size) {
// Since there is no input for block_size values, but it should be strictly
// determined, let's calculate these values using a couple of data bytes.
uint8_t temp_block_size = data[offset] ^ data[size - offset - 1];
// Let temp_block_size be in range from 0 to 0x3F (0b00111111).
temp_block_size &= 0x3F;
// XOR with previous block size to get different values for different data.
block_size ^= temp_block_size;
// Prevent infinite loop if block_size == 0.
block_size = std::max(block_size, static_cast<size_t>(1));
// Prevent out-of-bounds access.
block_size = std::min(block_size, size - offset);
// Create new buffer with current block of data and feed it to the decoder.
std::vector<uint8_t> buffer =
base::ToVector(data.subspan(offset, block_size));
int result = decoder.FilterBuf(buffer);
if (result < 0)
return 0;
}
return 0;
}
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