wininet: Fix invalid memory access in HTTP_QUERY_RAW_HEADERS (Valgrind).

dlls/wininet/http.c

@@ -3589,12 +3589,12 @@ static DWORD HTTP_HttpQueryInfoW(http_request_t *request, DWORD dwInfoLevel,
 
                 TRACE("returning data: %s\n", debugstr_wn(headers, len / sizeof(WCHAR)));
 
-                for (i=0; i<len; i++)
+                for (i = 0; i < len / sizeof(WCHAR); i++)
                 {
                     if (headers[i] == '\n')
                         headers[i] = 0;
                 }
-                memcpy(lpBuffer, headers, len + sizeof(WCHAR));
+                memcpy(lpBuffer, headers, len);
             }
             *lpdwBufferLength = len - sizeof(WCHAR);
 

dlls/wininet/tests/http.c

@@ -465,6 +465,7 @@ static void InternetReadFile_test(int flags, const test_data_t *test)
     char *post_data = NULL;
     BOOL res, on_async = TRUE;
     CHAR buffer[4000];
+    WCHAR wbuffer[4000];
     DWORD length, length2, index, exlen = 0, post_len = 0;
     const char *types[2] = { "*", NULL };
     HINTERNET hi, hic = 0, hor = 0;
@@ -649,6 +650,37 @@ static void InternetReadFile_test(int flags, const test_data_t *test)
     ok(buffer[length2+1] == 0x77, "Expected 0x77, got %02X\n", buffer[length2+1]);
     ok(length2 == length, "Value should not have changed: %d != %d\n", length2, length);
 
+    length = sizeof(wbuffer)-sizeof(WCHAR);
+    memset(wbuffer, 0x77, sizeof(wbuffer));
+    res = HttpQueryInfoW(hor, HTTP_QUERY_RAW_HEADERS, wbuffer, &length, 0x0);
+    ok(res, "HttpQueryInfoW(HTTP_QUERY_RAW_HEADERS) failed with error %d\n", GetLastError());
+    ok(length % sizeof(WCHAR) == 0, "Expected that length is a multiple of sizeof(WCHAR), got %d.\n", length);
+    length /= sizeof(WCHAR);
+    /* show that the function writes data past the length returned */
+    ok(wbuffer[length-2], "Expected any header character, got 0x0000\n");
+    ok(!wbuffer[length-1], "Expected 0x0000, got %04X\n", wbuffer[length-1]);
+    ok(!wbuffer[length], "Expected 0x0000, got %04X\n", wbuffer[length]);
+    ok(wbuffer[length+1] == 0x7777 || broken(wbuffer[length+1] != 0x7777),
+       "Expected 0x7777, got %04X\n", wbuffer[length+1]);
+
+    length2 = length*sizeof(WCHAR);
+    res = HttpQueryInfoW(hor,HTTP_QUERY_RAW_HEADERS,wbuffer,&length2,0x0);
+    ok(!res, "Expected 0x00, got %d\n", res);
+    ok(GetLastError() == ERROR_INSUFFICIENT_BUFFER, "Unexpected last error: %d\n", GetLastError());
+    ok(length2 % sizeof(WCHAR) == 0, "Expected that length is a multiple of sizeof(WCHAR), got %d.\n", length2);
+    length2 /= sizeof(WCHAR);
+    ok(length2 == length+1, "Expected %d, got %d\n", length+1, length2);
+    /* the in length of the buffer must be +1 but the length returned does not count this */
+    length2 = (length+1)*sizeof(WCHAR);
+    memset(wbuffer, 0x77, sizeof(wbuffer));
+    res = HttpQueryInfoW(hor,HTTP_QUERY_RAW_HEADERS,wbuffer,&length2,0x0);
+    ok(res, "HttpQueryInfoW(HTTP_QUERY_RAW_HEADERS) failed with error %d\n", GetLastError());
+    ok(length2 % sizeof(WCHAR) == 0, "Expected that length is a multiple of sizeof(WCHAR), got %d.\n", length2);
+    length2 /= sizeof(WCHAR);
+    ok(!wbuffer[length2], "Expected 0x0000, got %04X\n", wbuffer[length2]);
+    ok(wbuffer[length2+1] == 0x7777, "Expected 0x7777, got %04X\n", wbuffer[length2+1]);
+    ok(length2 == length, "Value should not have changed: %d != %d\n", length2, length);
+
     length = sizeof(buffer);
     res = InternetQueryOptionA(hor, INTERNET_OPTION_URL, buffer, &length);
     ok(res, "InternetQueryOptionA(INTERNET_OPTION_URL) failed: %u\n", GetLastError());