avformat/mov: check extent_offset calculation for overflow

Signed-off-by: James Almer <jamrial@gmail.com>
7 months ago · fbe52bd65c
parent b44758d8e4
commit fbe52bd65c
1 changed files with 2 additions and 1 deletions
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@ -8104,7 +8104,8 @@ static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
        }
        for (int j = 0; j < extent_count; j++) {
            if (rb_size(pb, &extent_offset, offset_size) < 0 ||
-                rb_size(pb, &extent_length, length_size) < 0)
+                rb_size(pb, &extent_length, length_size) < 0 ||
+                base_offset > INT64_MAX - extent_offset)
                return AVERROR_INVALIDDATA;
            if (offset_type == 1)
                c->heif_item[i].is_idat_relative = 1;