Отправить #498499: www.radare.org/ radare2/rasm2 473664b1e7fa76bcb72a1cb4f1c01e1e820b7c81 negative size param

**Description**
A segv can occur in radare2/rasm2 when using the "-i 6 -E 'mov eax, 30'" options. This issue leads to negative-size-param.

**Affected Version**
radare : https://github.com/radareorg/radare2/commit/473664b1e7fa76bcb72a1cb4f1c01e1e820b7c81

**Steps to Reproduce**
./bins/bin/rasm2 -i 6 -E 'mov eax, 30'
==1539759==ERROR: AddressSanitizer: negative-size-param: (size=-1)
#0 0x556fedbb114c in __asan_memmove (./radare2/bins/bin/rasm2+0xa014c) (BuildId: c182a69a7b8fb8b422226bca07598a5ba9758698)
#1 0x7fb5c11d72cf in r_main_rasm2 ./radare2/libr/main/rasm2.c:1063:5
#2 0x556fedbec7a1 in main ./radare2/binr/rasm2/rasm2.c:6:9
#3 0x7fb5c0f9c082 in __libc_start_main /build/glibc-FcRMwW/glibc-2.31/csu/../csu/libc-start.c:308:16
#4 0x556fedb2f31d in _start (./radare2/bins/bin/rasm2+0x1e31d) (BuildId: c182a69a7b8fb8b422226bca07598a5ba9758698)

0x602000009ddc is located 0 bytes to the right of 12-byte region [0x602000009dd0,0x602000009ddc)
allocated by thread T0 here:
#0 0x556fedb9c4c3 in strdup (./radare2/bins/bin/rasm2+0x8b4c3) (BuildId: c182a69a7b8fb8b422226bca07598a5ba9758698)
#1 0x7fb5c11d7259 in r_main_rasm2 ./radare2/libr/main/rasm2.c:1059:19
#2 0x556fedbec7a1 in main ./radare2/binr/rasm2/rasm2.c:6:9
#3 0x7fb5c0f9c082 in __libc_start_main /build/glibc-FcRMwW/glibc-2.31/csu/../csu/libc-start.c:308:16

SUMMARY: AddressSanitizer: negative-size-param (./radare2/bins/bin/rasm2+0xa014c) (BuildId: c182a69a7b8fb8b422226bca07598a5ba9758698) in __asan_memmove
==1539759==ABORTING

** Env **
Distributor ID: Ubuntu
Description: Ubuntu 20.04.6 LTS
Release: 20.04
Codename: focal

• Источник: ⚠️ https://github.com/radareorg/radare2/issues/23953#issue-2844325926
• Пользователь: wenjusun (UID 80422)
• Представление: 11.02.2025 14:06 (1 Год назад)
• Модерация: 16.02.2025 20:59 (5 days later)
• Статус: принято
• Запись VulDB: 295986 [radare2 5.9.9 33286 rasm2 /libr/main/rasm2.c повреждение памяти]
• Баллы: 20