integer overflow in `dec_vlc_read`

[libumem]

• Version: 0.3.0.0
• OS: Debian 12
• Command: ./oapv_app_dec -i ./poc_huge_dimensions.apv -m 1 -v 0

Attached is a zip with the file needed to reproduce this, assuming oapv_app_dec was built with UBSAN

UBSAN Trace

<removed>/src/oapv_vlc.c:739:24: runtime error: signed integer overflow: 1073741856 + 1073741824 cannot be represented in type 'int'
    #0 0x5a0fb5d9541b in dec_vlc_read <removed>/src/oapv_vlc.c:739:24
    #1 0x5a0fb5d94ae8 in oapvd_vlc_dc_coef <removed>/src/oapv_vlc.c:817:19
    #2 0x5a0fb5d67484 in dec_tile_comp <removed>/src/oapv.c:1513:27
    #3 0x5a0fb5d67484 in dec_tile <removed>/src/oapv.c:1586:15
    #4 0x5a0fb5d67484 in dec_thread_tile <removed>/src/oapv.c:1647:15
    #5 0x5a0fb5d63c1f in oapvd_decode <removed>/src/oapv.c:1888:19
    #6 0x5a0fb5d50132 in main <removed>/app/oapv_app_dec.c:560:15
    #7 0x7e9001644249 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #8 0x7e9001644304 in __libc_start_main csu/../csu/libc-start.c:360:3
    #9 0x5a0fb5c8e420 in _start (<removed>/build/bin/oapv_app_dec+0x51420) (BuildId: 56db50aa25683e3033552d96267c16b1450aad86)

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior <removed>/src/oapv_vlc.c:739:24 in 

poc.zip

[kpchoi]

Branch (https://github.com/AcademySoftwareFoundation/openapv/tree/kp_handling_issues_20260713) fixed this issue.