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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-03-17 13:31:28 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-03-19 23:59:45 +0100 |
| commit | 92fde2585e98b83143e84fd2899148990f594c3f (patch) | |
| tree | 7bdfa7ff5e9bde44c0b36df575b11f12993049fa | |
| parent | 462b8261aa3c4f9844b2e050c74b9a2018e3649d (diff) | |
| download | ffmpeg-92fde2585e98b83143e84fd2899148990f594c3f.tar.gz | |
avformat/mov: Check offset addition for overflow
Fixes: signed integer overflow: 9223372036854775807 + 536870912 cannot be represented in type 'long'
Fixes: 31678/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5614204619980800
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mov.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/libavformat/mov.c b/libavformat/mov.c index 97857789f4..f9c4dbe5d4 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -5051,6 +5051,7 @@ static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom) int64_t stream_size = avio_size(pb); int64_t offset = av_sat_add64(avio_tell(pb), atom.size), pts, timestamp; uint8_t version, is_complete; + int64_t offadd; unsigned i, j, track_id, item_count; AVStream *st = NULL; AVStream *ref_st = NULL; @@ -5088,11 +5089,15 @@ static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom) if (version == 0) { pts = avio_rb32(pb); - offset += avio_rb32(pb); + offadd= avio_rb32(pb); } else { pts = avio_rb64(pb); - offset += avio_rb64(pb); + offadd= avio_rb64(pb); } + if (av_sat_add64(offset, offadd) != offset + (uint64_t)offadd) + return AVERROR_INVALIDDATA; + + offset += (uint64_t)offadd; avio_rb16(pb); // reserved @@ -5115,6 +5120,8 @@ static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom) if (frag_stream_info) frag_stream_info->sidx_pts = timestamp; + if (av_sat_add64(offset, size) != offset + size) + return AVERROR_INVALIDDATA; offset += size; pts += duration; } |