From 538cca8bcd2f22282cf98d93951d9ff9510efefe Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Sat, 6 Jul 2019 06:20:01 +0200
Subject: [PATCH] Fix issue in file_stream.c - it would corrupt memory if
 maxlen is negative

---
 libretro-common/streams/file_stream.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libretro-common/streams/file_stream.c b/libretro-common/streams/file_stream.c
index aa22e0cdab..ce189f981c 100644
--- a/libretro-common/streams/file_stream.c
+++ b/libretro-common/streams/file_stream.c
@@ -221,6 +221,9 @@ int filestream_scanf(RFILE *stream, const char* format, ...)
    int        ret       = 0;
    int64_t maxlen       = filestream_read(stream, buf, sizeof(buf)-1);
 
+   if (maxlen <= 0)
+      return EOF;
+
    buf[maxlen] = '\0';
 
    va_start(args, format);