fix: prevent crash when worker terminates after a file upload

frankenphp.c

@@ -137,6 +137,7 @@ static void frankenphp_worker_request_shutdown() {
   zend_end_try();
 
   zend_set_memory_limit(PG(memory_limit));
+  SG(rfc1867_uploaded_files) = NULL;
 }
 
 /* Adapted from php_request_startup() */

frankenphp_test.go

@@ -5,10 +5,12 @@
 package frankenphp_test
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"io"
 	"log"
+	"mime/multipart"
 	"net/http"
 	"net/http/cookiejar"
 	"net/http/httptest"
@@ -600,6 +602,33 @@ func testRequestHeaders(t *testing.T, opts *testOptions) {
 	}, opts)
 }
 
+func TestFileUpload_module(t *testing.T) { testFileUpload(t, &testOptions{}) }
+func TestFileUpload_worker(t *testing.T) {
+	testFileUpload(t, &testOptions{workerScript: "file-upload.php"})
+}
+func testFileUpload(t *testing.T, opts *testOptions) {
+	runTest(t, func(handler func(http.ResponseWriter, *http.Request), _ *httptest.Server, i int) {
+		requestBody := &bytes.Buffer{}
+		writer := multipart.NewWriter(requestBody)
+		part, _ := writer.CreateFormFile("file", "foo.txt")
+		_, err := part.Write([]byte("bar"))
+		require.NoError(t, err)
+
+		writer.Close()
+
+		req := httptest.NewRequest("POST", "http://example.com/file-upload.php", requestBody)
+		req.Header.Add("Content-Type", writer.FormDataContentType())
+
+		w := httptest.NewRecorder()
+		handler(w, req)
+
+		resp := w.Result()
+		body, _ := io.ReadAll(resp.Body)
+
+		assert.Contains(t, string(body), "Upload OK")
+	}, opts)
+}
+
 func TestExecuteScriptCLI(t *testing.T) {
 	if _, err := os.Stat("internal/testcli/testcli"); err != nil {
 		t.Skip("internal/testcli/testcli has not been compiled, run `cd internal/testcli/ && go build`")

testdata/file-upload.php

@@ -0,0 +1,18 @@
+<?php
+require_once __DIR__.'/_executor.php';
+
+return function()
+{
+    $uploaded = ($_FILES['file']['tmp_name'] ?? null) ? file_get_contents($_FILES['file']['tmp_name']) : null;
+    if ($uploaded) {
+        echo 'Upload OK'; 
+        return;
+    }
+
+    echo <<<'HTML'
+    <form method="POST" enctype="multipart/form-data">
+        <input type="file" name="file">
+        <input type="submit">
+    </form>
+    HTML;
+};