From b5d8fe1c874947ca67ee8117b18f8052f0e590fc Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 11 Feb 2021 22:58:53 +0100 Subject: [PATCH] avformat/flvdec: Check array entry number Fixes: signed integer overflow: -2147483648 - 1 cannot be represented in type 'int' Fixes: 30209/clusterfuzz-testcase-minimized-ffmpeg_dem_FLV_fuzzer-5724831658147840 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/flvdec.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c index e4b40a195c..fca6f82f5c 100644 --- a/libavformat/flvdec.c +++ b/libavformat/flvdec.c @@ -875,6 +875,8 @@ static int amf_skip_tag(AVIOContext *pb, AMFDataType type, int depth) parse_name = 0; case AMF_DATA_TYPE_MIXEDARRAY: nb = avio_rb32(pb); + if (nb < 0) + return AVERROR_INVALIDDATA; case AMF_DATA_TYPE_OBJECT: while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) { if (parse_name) {