From db73ae0dc114aa6fae08e69f977944f056a24995 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 17 Sep 2022 23:15:56 +0200 Subject: [PATCH] avformat/icodec: Check nb_pal Fixes: signed integer overflow: 538976288 * 4 cannot be represented in type 'int' Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_ICO_fuzzer-6690068904935424 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Peter Ross Signed-off-by: Michael Niedermayer --- libavformat/icodec.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavformat/icodec.c b/libavformat/icodec.c index 290f658d0c..85dab3bca0 100644 --- a/libavformat/icodec.c +++ b/libavformat/icodec.c @@ -196,6 +196,9 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt) AV_WL32(buf + 32, image->nb_pal); } + if (image->nb_pal > INT_MAX / 4 - 14 - 40) + return AVERROR_INVALIDDATA; + AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4); AV_WL32(buf + 8, AV_RL32(buf + 8) / 2); }