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SUSE:SLE-15-SP1:GA
ffmpeg
ffmpeg-CVE-2021-3566.patch
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File ffmpeg-CVE-2021-3566.patch of Package ffmpeg
From 3bce9e9b3ea35c54bacccc793d7da99ea5157532 Mon Sep 17 00:00:00 2001 From: Paul B Mahol <onemda@gmail.com> Date: Mon, 27 Jan 2020 21:53:08 +0100 Subject: [PATCH] avformat/tty: add probe function --- libavformat/tty.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/libavformat/tty.c b/libavformat/tty.c index 8d48f2c45c..60f7e9f87e 100644 --- a/libavformat/tty.c +++ b/libavformat/tty.c @@ -34,6 +34,13 @@ #include "internal.h" #include "sauce.h" +static int isansicode(int x) +{ + return x == 0x1B || x == 0x0A || x == 0x0D || (x >= 0x20 && x < 0x7f); +} + +static const char tty_extensions[31] = "ans,art,asc,diz,ice,nfo,txt,vt"; + typedef struct TtyDemuxContext { AVClass *class; int chars_per_frame; @@ -42,6 +49,17 @@ typedef struct TtyDemuxContext { AVRational framerate; /**< Set by a private option. */ } TtyDemuxContext; +static int read_probe(const AVProbeData *p) +{ + int cnt = 0; + + for (int i = 0; i < p->buf_size; i++) + cnt += !!isansicode(p->buf[i]); + + return (cnt * 100LL / p->buf_size) * (cnt > 400) * + !!av_match_ext(p->filename, tty_extensions); +} + /** * Parse EFI header */ @@ -153,8 +171,9 @@ AVInputFormat ff_tty_demuxer = { .name = "tty", .long_name = NULL_IF_CONFIG_SMALL("Tele-typewriter"), .priv_data_size = sizeof(TtyDemuxContext), + .read_probe = read_probe, .read_header = read_header, .read_packet = read_packet, - .extensions = "ans,art,asc,diz,ice,nfo,txt,vt", + .extensions = tty_extensions, .priv_class = &tty_demuxer_class, }; -- 2.33.0
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