From 3c41d0bfd6041890b394a3e6eb2f8da92b83416b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 18 Dec 2020 23:13:58 +0100 Subject: [PATCH] avformat/rmdec: Fix codecdata_length overflow check Fixes: signed integer overflow: 2147483647 + 64 cannot be represented in type 'int' Fixes: 28509/clusterfuzz-testcase-minimized-ffmpeg_dem_IVR_fuzzer-6310969680723968 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/rmdec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c index 004c62086d..ae83a8afe7 100644 --- a/libavformat/rmdec.c +++ b/libavformat/rmdec.c @@ -254,7 +254,7 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb, if (version == 5) avio_r8(pb); codecdata_length = avio_rb32(pb); - if(codecdata_length + AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){ + if((unsigned)codecdata_length > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE){ av_log(s, AV_LOG_ERROR, "codecdata_length too large\n"); return -1; }