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User who did this - Bayan Towfiq (btowfiq)

Attached to Project - sip-router Summary - Double Free -- Crash/Coredump and possible security vulnerability Task Type - Bug Report Category - dialog Status - Assigned Assigned To - Timo Reimann Operating System - Linux Severity - Critical Priority - Normal Reported Version - Development Due in Version - Undecided Due Date - Undecided Details - version: kamailio 3.2.0 (x86_64/linux) 639f0a flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, DBG_QM_MALLOC, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 4MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 639f0a compiled on 07:18:31 Oct 29 2011 with gcc 4.4.3

Dialog module crashed in kamailio 3.2.0 with the following log error (double free) and below backtrace. This is a potential remote security vulnerability in addition to the crash which is why severity is set to Critical. Please let me know if further information is needed to debug.

Nov 6 18:04:33 guru /usr/local/sbin/kamailio[8282]: CRITICAL: dialog [dlg_hash.c:597]: bogus ref -1 with cnt 1 for dlg 0x7f47dbd0eee8 [16086:1982422345] with clid '1124787051_76787956@4.55.17.35' and tags 'gK0a13fca4' '' Nov 6 18:04:33 guru /usr/local/sbin/kamailio[8282]: : <core> [mem/q_malloc.c:457]: BUG: qm_free: freeing already freed pointer, first free: dialog: dlg_hash.c: destroy_dlg(217) - aborting Nov 6 18:04:33 guru /usr/local/sbin/kamailio[8294]: : <core> [pass_fd.c:293]: ERROR: receive_fd: EOF on 18 Nov 6 18:04:33 guru /usr/local/sbin/kamailio[8272]: ALERT: <core> [main.c:751]: child process 8282 exited by a signal 6 Nov 6 18:04:33 guru /usr/local/sbin/kamailio[8272]: ALERT: <core> [main.c:754]: core was generated Nov 6 18:05:33 guru /usr/local/sbin/kamailio[8272]: : <core> [main.c:660]: BUG: shutdown timeout triggered, dying... Nov 6 18:05:34 guru init: kamailio main process (8272) killed by ABRT signal Nov 6 18:05:34 guru init: kamailio main process ended, respawning Nov 6 18:05:34 guru kamailio: WARNING: <core> [daemonize.c:352]: pid file contains old pid, replacing pid

Full backtrace below:

(gdb) bt full #0 0x00007f47f38b3a75 in raise () from /lib/libc.so.6 No symbol table info available. #1 0x00007f47f38b75c0 in abort () from /lib/libc.so.6 No symbol table info available. #2 0x0000000000534708 in qm_free (qm=0x7f47db9be000, p=0x7f47dbe5d3a8, file=0x7f47ec231bef "dialog: dlg_hash.c", func=0x7f47ec231f52 "destroy_dlg", line=217) at mem/q_malloc.c:458 f = 0x7f47dbe5d378 size = <value optimized out> #3 0x00007f47ec218161 in destroy_dlg (dlg=0x7f47dbd0eee8) at dlg_hash.c:217 ret = <value optimized out> __FUNCTION__ = "destroy_dlg" #4 0x00007f47ec21a545 in unref_dlg (dlg=0x7f47dbd0eee8, cnt=0) at dlg_hash.c:597 d_entry = 0x7f47dbcb1c80 #5 0x00007f47f193d5bd in free_cell (dead_cell=0x7f47dbe48920) at h_table.c:175 b = <value optimized out> i = <value optimized out> rpl = <value optimized out> tt = <value optimized out> foo = <value optimized out> cbs = 0x7f47dbcc5970 __FUNCTION__ = "free_cell" #6 0x00007f47f195991b in wait_handler (ti=<value optimized out>, wait_tl=<value optimized out>, data=<value optimized out>) at timer.c:676 p_cell = 0x7f47dbe48920 #7 0x000000000051f4fd in timer_list_expire () at timer.c:894 tl = 0x7f47dbe489a0 ret = <value optimized out> #8 timer_handler () at timer.c:959 saved_ticks = 444520143 run_slow_timer = <value optimized out> #9 timer_main () at timer.c:998 No locals. #10 0x000000000046454f in main_loop () at main.c:1655 i = 8 pid = <value optimized out> si = 0x0 si_desc = "udp receiver child=7 sock=70.167.153.130:5060\000\000\000\000\000@\020", '\000' <repeats 12 times>, "\016\b\000\000\000\000\000\000\000\200\271،*\306v&\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\300\v\215\000\000\000\000\000"\000\000\000\000\000\000\000\000\000@\020", '\000' <repeats 11 times> #11 0x0000000000465dd2 in main (argc=11, argv=0x7fff47fcb288) at main.c:2475 cfg_stream = <value optimized out> c = <value optimized out> r = <value optimized out> tmp = 0x7fff47fcbe83 "" tmp_len = 0 port = <value optimized out> proto = <value optimized out> ret = <value optimized out> seed = 1033789824 rfd = <value optimized out> debug_save = 272629760 debug_flag = 34 dont_fork_cnt = 0 n_lst = 0x10400000 p = <value optimized out> (gdb)

More information can be found at the following URL: http://sip-router.org/tracker/index.php?do=details&task_id=173

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