Add some checks.

GitOrigin-RevId: 6c24e7d3d48ed823a45d6b106855f3a0f55a0db5

tdnet/td/net/HttpReader.cpp

@@ -148,6 +148,7 @@ Result<size_t> HttpReader::read_next(HttpQuery *query) {
             end_p--;
           }
 
+          CHECK(p != nullptr);
           Slice boundary(p, static_cast<size_t>(end_p - p));
           if (boundary.empty() || boundary.size() > MAX_BOUNDARY_LENGTH) {
             return Status::Error(400, "Bad Request: boundary too big or empty");

tdnet/td/net/SslStream.cpp

@@ -515,6 +515,7 @@ int strm_read(BIO *b, char *buf, int len) {
   auto *stream = static_cast<SslStreamImpl *>(BIO_get_data(b));
   CHECK(stream != nullptr);
   BIO_clear_retry_flags(b);
+  CHECK(buf != nullptr);
   int res = narrow_cast<int>(stream->flow_read(MutableSlice(buf, len)));
   if (res == 0) {
     BIO_set_retry_read(b);
@@ -526,6 +527,7 @@ int strm_write(BIO *b, const char *buf, int len) {
   auto *stream = static_cast<SslStreamImpl *>(BIO_get_data(b));
   CHECK(stream != nullptr);
   BIO_clear_retry_flags(b);
+  CHECK(buf != nullptr);
   return narrow_cast<int>(stream->flow_write(Slice(buf, len)));
 }
 }  // namespace

tdutils/td/utils/Parser.h

@@ -45,7 +45,7 @@ class ParserImpl {
     return ptr_ == end_;
   }
   void clear() {
-    ptr_ = nullptr;
+    ptr_ = SliceT().begin();
     end_ = ptr_;
     status_ = Status::OK();
   }