diff options
Diffstat (limited to 'src/test/fuzz/http_request.cpp')
| -rw-r--r-- | src/test/fuzz/http_request.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/test/fuzz/http_request.cpp b/src/test/fuzz/http_request.cpp index ebf89749e9..36d44e361f 100644 --- a/src/test/fuzz/http_request.cpp +++ b/src/test/fuzz/http_request.cpp @@ -7,6 +7,7 @@ #include <test/fuzz/FuzzedDataProvider.h> #include <test/fuzz/fuzz.h> #include <test/fuzz/util.h> +#include <util/strencodings.h> #include <event2/buffer.h> #include <event2/event.h> @@ -48,7 +49,14 @@ void test_one_input(const std::vector<uint8_t>& buffer) assert(evbuf != nullptr); const std::vector<uint8_t> http_buffer = ConsumeRandomLengthByteVector(fuzzed_data_provider, 4096); evbuffer_add(evbuf, http_buffer.data(), http_buffer.size()); - if (evhttp_parse_firstline_(evreq, evbuf) != 1 || evhttp_parse_headers_(evreq, evbuf) != 1) { + // Avoid constructing requests that will be interpreted by libevent as PROXY requests to avoid triggering + // a nullptr dereference. The dereference (req->evcon->http_server) takes place in evhttp_parse_request_line + // and is a consequence of our hacky but necessary use of the internal function evhttp_parse_firstline_ in + // this fuzzing harness. The workaround is not aesthetically pleasing, but it successfully avoids the troublesome + // code path. " http:// HTTP/1.1\n" was a crashing input prior to this workaround. + const std::string http_buffer_str = ToLower({http_buffer.begin(), http_buffer.end()}); + if (http_buffer_str.find(" http://") != std::string::npos || http_buffer_str.find(" https://") != std::string::npos || + evhttp_parse_firstline_(evreq, evbuf) != 1 || evhttp_parse_headers_(evreq, evbuf) != 1) { evbuffer_free(evbuf); evhttp_request_free(evreq); return; |