Fix possible stack buffer overflow

diff --git a/ext/fileinfo/libmagic/funcs.c b/ext/fileinfo/libmagic/funcs.c
index 972d8d6c4068ec81664170042d5d9d4cf84fed0a..651fc15c196a7591de9911acf92ba8262c57db09 100644 (file)
--- a/ext/fileinfo/libmagic/funcs.c
+++ b/ext/fileinfo/libmagic/funcs.c
@@ -239,8 +239,15 @@ file_buffer(struct magic_set *ms, php_stream *stream, const char *inname, const
        }
 
        /* Check if we have a CDF file */
-       if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0) {
-               if (stream && SUCCESS == php_stream_cast(stream, PHP_STREAM_AS_FD, (void **)&fd, 0)) {
+       if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0 && stream) {
+#ifdef _WIN64
+               php_socket_t _fd = fd;
+               int _ret = php_stream_cast(stream, PHP_STREAM_AS_FD, (void **)&_fd, 0);
+               fd = (int)_fd;
+#else
+               int _ret = php_stream_cast(stream, PHP_STREAM_AS_FD, (void **)&fd, 0);
+#endif
+               if (SUCCESS == _ret) {
                        m = file_trycdf(ms, &b);
                        if ((ms->flags & MAGIC_DEBUG) != 0)
                                (void)fprintf(stderr, "[try cdf %d]\n", m);