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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 949f0a6be9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
tags/n4.3.2
Michael Niedermayer 5 years ago
parent
commit
9514228b3d
1 changed files with 6 additions and 0 deletions
  1. +6
    -0
      libavcodec/ansi.c

+ 6
- 0
libavcodec/ansi.c View File

@@ -475,6 +475,11 @@ 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"),
@@ -486,4 +491,5 @@ AVCodec ff_ansi_decoder = {
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.defaults = ansi_defaults,
};

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