From 51625c3a41fd561f17a8cd46ef0eac194d2eb686 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 19 Sep 2020 21:17:32 +0200
Subject: [PATCH] avcodec/ansi: Check initial dimensions

Fixes: Timeout (minutes to less than 1sec)
Fixes: 25682/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ANSI_fuzzer-6320712032452608

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 949f0a6be974e4083f8e130c2d6870ef26f0eece)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/ansi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/ansi.c b/libavcodec/ansi.c
index c42d6d3dba..e4106dcf72 100644
--- a/libavcodec/ansi.c
+++ b/libavcodec/ansi.c
@@ -474,6 +474,11 @@ static av_cold int decode_close(AVCodecContext *avctx)
     return 0;
 }
 
+static const AVCodecDefault ansi_defaults[] = {
+    { "max_pixels", "640*480" },
+    { NULL },
+};
+
 AVCodec ff_ansi_decoder = {
     .name           = "ansi",
     .long_name      = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
@@ -485,4 +490,5 @@ AVCodec ff_ansi_decoder = {
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
+    .defaults       = ansi_defaults,
 };