avcodec: Constify AVCodecs

[ffmpeg] / libavcodec / lscrdec.c

diff --git a/libavcodec/lscrdec.c b/libavcodec/lscrdec.c
index e706dda9da5d4d9d038dd958a0a61fb21a507bf0..18f46bd27c475dc4fc0f8e11f2c978de6399a822 100644 (file)
--- a/libavcodec/lscrdec.c
+++ b/libavcodec/lscrdec.c
@@ -1,4 +1,6 @@
 /*
+ * Copyright (c) 2019 Paul B Mahol
+ *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
@@ -74,6 +76,10 @@ static int decode_idat(LSCRContext *s, int length)
     int ret;
     s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
     s->zstream.next_in  = s->gb.buffer;
+
+    if (length <= 0)
+        return AVERROR_INVALIDDATA;
+
     bytestream2_skip(&s->gb, length);
 
     /* decode one line if possible */
@@ -258,7 +264,7 @@ static void lscr_decode_flush(AVCodecContext *avctx)
     av_frame_unref(s->last_picture);
 }
 
-AVCodec ff_lscr_decoder = {
+const AVCodec ff_lscr_decoder = {
     .name           = "lscr",
     .long_name      = NULL_IF_CONFIG_SMALL("LEAD Screen Capture"),
     .type           = AVMEDIA_TYPE_VIDEO,