From 19e6b871b6c1fd02deb96898d6660857a3952f82 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 26 Apr 2024 03:46:33 +0200 Subject: [PATCH] avformat/mxfdec: Check body_offset MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fixes: signed integer overflow: 538976288 - -9223372036315799520 cannot be represented in type 'long' Fixes: 68060/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-5523457266745344 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Tomas Härdin Signed-off-by: Michael Niedermayer (cherry picked from commit 20a6bfda0f7c6447ac94611736cee6e9ce6972a0) Signed-off-by: Michael Niedermayer --- libavformat/mxfdec.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c index f5215b0163..de78b781d4 100644 --- a/libavformat/mxfdec.c +++ b/libavformat/mxfdec.c @@ -791,6 +791,9 @@ static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size partition->index_sid = avio_rb32(pb); partition->body_offset = avio_rb64(pb); partition->body_sid = avio_rb32(pb); + if (partition->body_offset < 0) + return AVERROR_INVALIDDATA; + if (avio_read(pb, op, sizeof(UID)) != sizeof(UID)) { av_log(mxf->fc, AV_LOG_ERROR, "Failed reading UID\n"); return AVERROR_INVALIDDATA;