[asterisk-bugs] [JIRA] (ASTERISK-27952) Segfault after pjsip hdr linked list corruption

[lvl (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=244676#comment-244676 ] 

lvl commented on ASTERISK-27952:
--------------------------------

The Asterisk was compiled with DONT_OPTIMIZE, but not with BETTER_BACKTRACES. I'll look into that.

I understand that it's a tricky issue to comment on. Will pull in 15.6 as soon as possible after it has landed, and report back here when the problem reappears.

> Segfault after pjsip hdr linked list corruption
> -----------------------------------------------
>
>                 Key: ASTERISK-27952
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27952
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: pjproject/pjsip
>    Affects Versions: 15.3.0
>            Reporter: lvl
>            Assignee: lvl
>              Labels: pjsip
>         Attachments: backtrace.txt
>
>
> Twice now, we've experienced an Asterisk segfault which was caused by a corrupted "hdr" linked list. This only happens once every thousands of calls so I'm not able to draw a connection yet, but as far as I can see there was nothing out of the ordinary for the affected calls.
> Might be related to ASTERISK-27792 and ASTERISK-26832.
> As you can see the first couple of header entries in the list are completely normal, but eventually hdr.next points to an invalid memory address.
> Case 1:
> {code}
> #0  pj_stricmp (str1=str1 at entry=0x1e, str2=str2 at entry=0x7f17a4baead0) at ../include/pj/string_i.h:216
> #1  0x00007f18d1d549a5 in pjsip_msg_find_hdr_by_name (msg=0x7f181c245180, name=name at entry=0x7f17a4baead0, start=start at entry=0x0) at ../src/pjsip/sip_msg.c:363
>         hdr = 0x6
>         end = 0x7f181c2451a8
> {code}
> {code}
> (gdb) print *msg.hdr.next.next.next.next.next.next.next.next.next.next
> $23 = {
>   prev = 0x7f187406d368, 
>   next = 0x7f18741e3568, 
>   type = PJSIP_H_OTHER, 
>   name = {
>     ptr = 0x7f18d1ddfedd "Min-SE", 
>     slen = 6
>   }, 
>   sname = {
>     ptr = 0x0, 
>     slen = 0
>   }, 
>   vptr = 0x7f18d2022d00 <min_se_hdr_vptr>
> }
> (gdb) print *msg.hdr.next.next.next.next.next.next.next.next.next.next.next
> $24 = {
>   prev = 0x7f1874041098, 
>   next = 0x6, 
>   type = 177, 
>   name = {
>     ptr = 0x7f1874036040 "al-queuemember-0006aa1a;2\033[0m\", \"\033[1;35mARRAY(target_username xxxx \001", 
>     slen = 139743010334336
>   }, 
>   sname = {
>     ptr = 0x0, 
>     slen = 4294967295
>   }, 
>   vptr = 0x0
> }
> {code}
> Case 2:
> {code}
> #0  pjsip_hdr_print_on (hdr_ptr=0x7f3133322e36, buf=0x7f0fbc1f3430 "Content-Type: application/sdprnContent-Length:   261rnrnv=0rno=- 572496747 572496749 xxxx"..., len=31096) at ../src/pjsip/sip_msg.c:584
>         hdr = 0x7f3133322e36
> #1  0x00007f1034e4ac85 in pjsip_msg_print (msg=0x7f0f180bff30, buf=0x7f0fbc1f30a8 "SIP/2.0 183 Session ProgressrnVia: xxxx"..., size=<optimized out>) at ../src/pjsip/sip_msg.c:464
>         p = 0x7f0fbc1f3430 "Content-Type: application/sdprnContent-Length:   261rnrnv=0rno=- 572496747 572496749 xxxx"...
>         end = 0x7f0fbc1fada8 "250255037274017177" 
>         len = <optimized out>
>         hdr = 0x7f3133322e36
>         clen_hdr = {ptr = 0x7f1034ed8eef "Content-Length: ", slen = 16}
> {code}
> {code}
> (gdb) p *msg.hdr.next.next.next.next.next.next.next.next.next.next.next
> $14 = {
>   prev = 0x7f0fbc34a730, 
>   next = 0x7f0fbc1fb9e8, 
>   type = PJSIP_H_ALLOW, 
>   name = {
>     ptr = 0x7f1034ed9284 "Allow", 
>     slen = 5
>   }, 
>   sname = {
>     ptr = 0x7f1034ed9284 "Allow", 
>     slen = 5
>   }, 
>   vptr = 0x7f103511b3a0 <generic_array_hdr_vptr>
> }
> (gdb) p *msg.hdr.next.next.next.next.next.next.next.next.next.next.next.next
> $15 = {
>   prev = 0x362e3333322e3738, 
>   next = 0x7f3133322e36, 
>   type = PJSIP_H_CONTACT, 
>   name = {
>     ptr = 0x7f1034ed27eb "Contact", 
>     slen = 7
>   }, 
>   sname = {
>     ptr = 0x7f1034eec21a "m", 
>     slen = 1
>   }, 
>   vptr = 0x7f103511b340 <contact_hdr_vptr>
> }
> (gdb) p *msg.hdr.next.next.next.next.next.next.next.next.next.next.next.next.next
> Cannot access memory at address 0x7f3133322e36
> {code}



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