A SEGV issue was found in MP4Box, to reproduce, compile gpac as follows:
```
CC=gcc CXX=g++ CFLAGS="-fsanitize=address" CXXFLAGS="-fsanitize=address" LDFLAGS="-fsanitize=address" ./configure --enable-debug
```
run poc file :
```
./bin/gcc/MP4Box -hint poc -out /dev/null
```
Detailed ASAN result is as below:
```
AddressSanitizer:DEADLYSIGNAL
=================================================================
==41259==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x7fbd5888dfc5 bp 0x7ffc4506ab50 sp 0x7ffc45068310 T0)
==41259==The signal is caused by a READ memory access.
==41259==Hint: address points to the zero page.
    #0 0x7fbd5888dfc4 in gf_hinter_finalize media_tools/isom_hinter.c:1271
    #1 0x55f3999fd019 in HintFile /home/src/gpac/applications/mp4box/main.c:3467
    #2 0x55f399a07e70 in mp4boxMain /home/src/gpac/applications/mp4box/main.c:6209
    #3 0x55f399a08653 in main /home/src/gpac/applications/mp4box/main.c:6335
    #4 0x7fbd582d30b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #5 0x55f3999f42ad in _start (/home/src/gpac/bin/gcc/MP4Box+0x182ad)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV media_tools/isom_hinter.c:1271 in gf_hinter_finalize
==41259==ABORTING

```
Credit : ADLab of Venustech

[poc_segv_isom_hinter_c_1271.zip](https://github.com/gpac/gpac/files/6403969/poc_segv_isom_hinter_c_1271.zip)

SEGV in gpac MP4Box in file isom_hinter.c:1271
This is a GitHub Issue
repo:gpac
owner:gpac
Title : SEGV in gpac MP4Box in file isom_hinter.c:1271
Issue date:

--- start body ---
A SEGV issue was found in MP4Box, to reproduce, compile gpac as follows:
```
CC=gcc CXX=g++ CFLAGS="-fsanitize=address" CXXFLAGS="-fsanitize=address" LDFLAGS="-fsanitize=address" ./configure --enable-debug
```
run poc file :
```
./bin/gcc/MP4Box -hint poc -out /dev/null
```
Detailed ASAN result is as below:
```
AddressSanitizer:DEADLYSIGNAL
=================================================================
==41259==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x7fbd5888dfc5 bp 0x7ffc4506ab50 sp 0x7ffc45068310 T0)
==41259==The signal is caused by a READ memory access.
==41259==Hint: address points to the zero page.
    #0 0x7fbd5888dfc4 in gf_hinter_finalize media_tools/isom_hinter.c:1271
    #1 0x55f3999fd019 in HintFile /home/src/gpac/applications/mp4box/main.c:3467
    #2 0x55f399a07e70 in mp4boxMain /home/src/gpac/applications/mp4box/main.c:6209
    #3 0x55f399a08653 in main /home/src/gpac/applications/mp4box/main.c:6335
    #4 0x7fbd582d30b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #5 0x55f3999f42ad in _start (/home/src/gpac/bin/gcc/MP4Box+0x182ad)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV media_tools/isom_hinter.c:1271 in gf_hinter_finalize
==41259==ABORTING

```
Credit : ADLab of Venustech

[poc_segv_isom_hinter_c_1271.zip](https://github.com/gpac/gpac/files/6403969/poc_segv_isom_hinter_c_1271.zip)

--- end body ---
