ffmpeg | branch: master | Michael Niedermayer <[email protected]> | Wed Mar 17 13:31:28 2021 +0100| [92fde2585e98b83143e84fd2899148990f594c3f] | committer: Michael Niedermayer
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 <[email protected]> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=92fde2585e98b83143e84fd2899148990f594c3f --- libavformat/mov.c | 11 +++++++++-- 1 file 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; } _______________________________________________ ffmpeg-cvslog mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
