SEGV on unknown address on gf_list_count

[strongcourage]

Hi,
Our fuzzer found an UAF on MP4Box (the latest commit 987169b on master).
PoC: https://github.com/strongcourage/PoCs/blob/master/gpac_987169b/PoC_segv_gf_list_count
Command: MP4Box -info $PoC
ASAN says:

==19963==ERROR: AddressSanitizer: SEGV on unknown address 0x00047fff8001 (pc 0x00000047a43d bp 0x60800000bfa0 sp 0x7ffe5b9765b0 T0)
    #0 0x47a43c in gf_list_count /home/dungnguyen/gueb-testing/gpac-head/src/utils/list.c:641
    #1 0x9809d4 in gf_m2ts_process_pmt /home/dungnguyen/gueb-testing/gpac-head/src/media_tools/mpegts.c:2185
    #2 0x970944 in gf_m2ts_section_complete /home/dungnguyen/gueb-testing/gpac-head/src/media_tools/mpegts.c:1610
    #3 0x971fa2 in gf_m2ts_gather_section /home/dungnguyen/gueb-testing/gpac-head/src/media_tools/mpegts.c:1740
    #4 0x97991c in gf_m2ts_process_packet /home/dungnguyen/gueb-testing/gpac-head/src/media_tools/mpegts.c:3446
    #5 0x97991c in gf_m2ts_process_data /home/dungnguyen/gueb-testing/gpac-head/src/media_tools/mpegts.c:3507
    #6 0x986f65 in gf_m2ts_probe_file /home/dungnguyen/gueb-testing/gpac-head/src/media_tools/mpegts.c:4641
    #7 0x963fa9 in gf_media_import /home/dungnguyen/gueb-testing/gpac-head/src/media_tools/media_import.c:10998
    #8 0x45b475 in convert_file_info /home/dungnguyen/gueb-testing/gpac-head/applications/mp4box/fileimport.c:124
    #9 0x43ac0c in mp4boxMain /home/dungnguyen/gueb-testing/gpac-head/applications/mp4box/main.c:4804
    #10 0x7ff2747fe82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #11 0x421eb8 in _start (/home/dungnguyen/PoCs/gpac_987169b/MP4Box-asan+0x421eb8)

Thanks,
Manh Dung

[jeanlf]

this was fixed after fixing #1266, #1267, #1268, #1269,