Created attachment 38606 [details]
crash seed

Hello htdbm developers,
We recently conducted a fuzzing test on htdbm and discovered a SEGV bug. We would like to provide a detailed description of the bug and seek your assistance in addressing it.

version:
htdbm: 2.4.54
gcc:gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
ubuntu: 20.04

command to reproduce:
htdbm -b SEGV_2 
SEGV_2 is attached to this report.


ASAN report:
=================================================================
==2664561==ERROR: AddressSanitizer: SEGV on unknown address 0x62100001295b (pc 0x7f9fa08a6a7b bp 0x62100000297a sp 0x7ffe19e35310 T0)
==2664561==The signal is caused by a WRITE memory access.
    #0 0x7f9fa08a6a7b in __ham_insertpair (/lib/x86_64-linux-gnu/libdb-5.3.so+0x55a7b)
    #1 0x7f9fa08a9523 in __ham_add_el (/lib/x86_64-linux-gnu/libdb-5.3.so+0x58523)
    #2 0x7f9fa08a0f46  (/lib/x86_64-linux-gnu/libdb-5.3.so+0x4ff46)
    #3 0x7f9fa0937669 in __dbc_iput (/lib/x86_64-linux-gnu/libdb-5.3.so+0xe6669)
    #4 0x7f9fa09323b9 in __db_put (/lib/x86_64-linux-gnu/libdb-5.3.so+0xe13b9)
    #5 0x7f9fa0947c25 in __db_put_pp (/lib/x86_64-linux-gnu/libdb-5.3.so+0xf6c25)
    #6 0x7f9fa15908f4  (/usr/lib/x86_64-linux-gnu/apr-util-1/apr_dbm_db-1.so+0x18f4)
    #7 0x4d0ab7 in htdbm_save /home/root/sp/Dataset/Httpd/httpd_aflpp/support/htdbm.c:175:12
    #8 0x4cd974 in main /home/root/sp/Dataset/Httpd/httpd_aflpp/support/htdbm.c:453:19
    #9 0x7f9fa2290082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
    #10 0x41d58d in _start (/home/root/sp/Fuzz/aflpp_fuzz/Httpd/document_group/mb/htdbm_1/htdbm+0x41d58d)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib/x86_64-linux-gnu/libdb-5.3.so+0x55a7b) in __ham_insertpair
==2664561==ABORTING

Thank you for your attention and support.
Best regards,
Michael Zhang.