A NULL pointer dereference exists in the function dwg_add_u8_input in dwg_api.c

[iorra-cifer]

System info
Ubuntu x86_64, clang 10.0
version: 0.12.4.4643, last commit 93c2512

Command line
./dwg2dxf poc

Poc
poc : poc

AddressSanitizer output
==4083103==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f9ed611a461 bp 0x7ffe67ee4170 sp 0x7ffe67ee3928 T0)
==4083103==The signal is caused by a READ memory access.
==4083103==Hint: address points to the zero page.
#0 0x7f9ed611a461 /build/glibc-CVJwZb/glibc-2.27/string/../sysdeps/x86_64/multiarch/strlen-avx2.S:65
#1 0x42e128 in strlen /home/brian/src/final/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc
#2 0x1441668 in dwg_add_u8_input /home/SVF-tools/example/libredwg-2/src/dwg_api.c:22216:41
#3 0x1450aa4 in dwg_add_BLOCK_HEADER /home/SVF-tools/example/libredwg-2/src/dwg_api.c:24594:3
#4 0x11764e3 in decode_preR13_section /home/SVF-tools/example/libredwg-2/src/decode_r11.c:308:20
#5 0x111f472 in decode_preR13 /home/SVF-tools/example/libredwg-2/src/decode_r11.c:809:12
#6 0x4fb4b6 in dwg_decode /home/SVF-tools/example/libredwg-2/src/decode.c:211:17
#7 0x4c6dcc in dwg_read_file /home/SVF-tools/example/libredwg-2/src/dwg.c:254:11
#8 0x4c4a40 in main /home/SVF-tools/example/libredwg-2/programs/dwg2dxf.c:258:15
#9 0x7f9ed5fadc86 in __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310
#10 0x41b649 in _start (/home/SVF-tools/example/libredwg-2/fuzz/dwg2dxf.ci+0x41b649)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /build/glibc-CVJwZb/glibc-2.27/string/../sysdeps/x86_64/multiarch/strlen-avx2.S:65
==4083103==ABORTING