From 20b3decce11bf7da94a707fa0c76d38d9689fbd8 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 16 Jun 2019 16:01:45 +0200 Subject: [PATCH] avcodec/bintext: Check font height Fixes: division by zero Fixes: 15257/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BINTEXT_fuzzer-5757352881422336 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit bfb58bdd7015a6df2d130c92cf284d6a2362f3df) Signed-off-by: Michael Niedermayer --- libavcodec/bintext.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libavcodec/bintext.c b/libavcodec/bintext.c index d967317671..8e5c44446c 100644 --- a/libavcodec/bintext.c +++ b/libavcodec/bintext.c @@ -63,6 +63,10 @@ static av_cold int decode_init(AVCodecContext *avctx) av_log(avctx, AV_LOG_ERROR, "not enough extradata\n"); return AVERROR_INVALIDDATA; } + if (!s->font_height) { + av_log(avctx, AV_LOG_ERROR, "invalid font height\n"); + return AVERROR_INVALIDDATA; + } } else { s->font_height = 8; s->flags = 0;