From 7ec414892ddcad88313848494b6fc5f437c9ca4a Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 26 Aug 2017 01:26:58 +0200 Subject: avformat/hls: Fix DoS due to infinite loop Fixes: loop.m3u The default max iteration count of 1000 is arbitrary and ideas for a better solution are welcome Found-by: Xiaohei and Wangchu from Alibaba Security Team Previous version reviewed-by: Steven Liu Signed-off-by: Michael Niedermayer --- libavformat/hls.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'libavformat/hls.c') diff --git a/libavformat/hls.c b/libavformat/hls.c index 01731bd36b..0995345bbf 100644 --- a/libavformat/hls.c +++ b/libavformat/hls.c @@ -205,6 +205,7 @@ typedef struct HLSContext { AVDictionary *avio_opts; int strict_std_compliance; char *allowed_extensions; + int max_reload; } HLSContext; static int read_chomp_line(AVIOContext *s, char *buf, int maxlen) @@ -1263,6 +1264,7 @@ static int read_data(void *opaque, uint8_t *buf, int buf_size) HLSContext *c = v->parent->priv_data; int ret, i; int just_opened = 0; + int reload_count = 0; restart: if (!v->needed) @@ -1294,6 +1296,9 @@ restart: reload_interval = default_reload_interval(v); reload: + reload_count++; + if (reload_count > c->max_reload) + return AVERROR_EOF; if (!v->finished && av_gettime_relative() - v->last_load_time >= reload_interval) { if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) { @@ -2150,6 +2155,8 @@ static const AVOption hls_options[] = { OFFSET(allowed_extensions), AV_OPT_TYPE_STRING, {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"}, INT_MIN, INT_MAX, FLAGS}, + {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded", + OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS}, {NULL} }; -- cgit v1.2.3