@@ -5047,6 +5047,7 @@ 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;
@@ -5084,11 +5085,15 @@ 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
@@ -5111,6 +5116,8 @@ 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;
}
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> --- libavformat/mov.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)