From 0011b1f9e8682d62921a6b6ca9de0652f057ebf6 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 30 Jan 2021 00:46:26 +0100 Subject: [PATCH] avcodec/vp3: Check input amount in theora_decode_header() Fixes: Timeout Fixes: 29226/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_THEORA_fuzzer-6195092572471296 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Peter Ross Signed-off-by: Michael Niedermayer (cherry picked from commit 869fe41d1088c4badcd98ee1ca2490451a07b173) Signed-off-by: Michael Niedermayer --- libavcodec/vp3.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c index 6fe1ca46a3..c79b57e124 100644 --- a/libavcodec/vp3.c +++ b/libavcodec/vp3.c @@ -2920,6 +2920,9 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb) int ret; AVRational fps, aspect; + if (get_bits_left(gb) < 206) + return AVERROR_INVALIDDATA; + s->theora_header = 0; s->theora = get_bits(gb, 24); av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora);