CVE-2021-40559: Segmentation fault casued by null pointer dereference using mp4box in naludmx_parse_nal_avc, reframe_nalu.c:2474 · Issue #1886 · gpac/gpac

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• I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
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Hi, there.

There is a segmentation fault caused by null pointer dereference in naludmx_parse_nal_avc, reframe_nalu.c:2474 in commit 592ba26.

Here is my environment, compiler info and gpac version:

Distributor ID: Ubuntu
Description:    Ubuntu 16.04.6 LTS
Release:    16.04
Codename:   xenial
gcc: 5.4.0

MP4Box - GPAC version 1.1.0-DEV-rev1170-g592ba26-master
(c) 2000-2021 Telecom Paris distributed under LGPL v2.1+ - http://gpac.io
    MINI build (encoders, decoders, audio and video output disabled)

Please cite our work in your research:
    GPAC Filters: https://doi.org/10.1145/3339825.3394929
    GPAC: https://doi.org/10.1145/1291233.1291452

GPAC Configuration: --static-bin --enable-debug
Features: GPAC_CONFIG_LINUX GPAC_64_BITS GPAC_HAS_SOCK_UN GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_FREETYPE GPAC_HAS_JPEG GPAC_HAS_PNG  GPAC_DISABLE_3D

To reproduce, run

POC:
poc.zip
(unzip first)

Here is the trace reported by gdb:

#0  0x00000000008ac435 in naludmx_parse_nal_avc (ctx=0x1259a80, data=0x1239f73 "tr\372!", size=0xe, nal_type=0x14, skip_nal=0x7fffffff4fc4, is_slice=0x7fffffff4fd0, is_islice=0x7fffffff4fd4) at /mnt/data/playground/gpac/src/filters/reframe_nalu.c:2474
#1  0x00000000008ad7d3 in naludmx_process (filter=0x124cbe0) at /mnt/data/playground/gpac/src/filters/reframe_nalu.c:2874
#2  0x00000000007480a0 in gf_filter_process_task (task=0x123eee0) at /mnt/data/playground/gpac/src/filter_core/filter.c:2441
#3  0x000000000073798c in gf_fs_thread_proc (sess_thread=0x12382e0) at /mnt/data/playground/gpac/src/filter_core/filter_session.c:1640
#4  0x0000000000738305 in gf_fs_run (fsess=0x1238250) at /mnt/data/playground/gpac/src/filter_core/filter_session.c:1877
#5  0x00000000006571ea in gf_media_import (importer=0x7fffffff5bf0) at /mnt/data/playground/gpac/src/media_tools/media_import.c:1178
#6  0x000000000042cdf9 in convert_file_info (inName=0x7fffffffe163 "tmp", trackID=0x0) at /mnt/data/playground/gpac/applications/mp4box/fileimport.c:128
#7  0x00000000004168c3 in mp4boxMain (argc=0x7, argv=0x7fffffffddb8) at /mnt/data/playground/gpac/applications/mp4box/main.c:5925
#8  0x0000000000418d6b in main (argc=0x7, argv=0x7fffffffddb8) at /mnt/data/playground/gpac/applications/mp4box/main.c:6455
#9  0x0000000000caaa06 in generic_start_main ()
#10 0x0000000000caaff5 in __libc_start_main ()
#11 0x0000000000403f39 in _start ()