i386/72676: telnet client crashes regularly on 4.10-STABLE if interrupted before connection is established

[Adrian Pircalabu]

>Number:         72676
>Category:       i386
>Synopsis:       telnet client crashes regularly on 4.10-STABLE if interrupted before connection is established
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Oct 14 09:50:22 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Adrian Pircalabu
>Release:        4.10-STABLE
>Organization:
BitDefender
>Environment:
FreeBSD host 4.10-STABLE FreeBSD 4.10-STABLE #4: Mon Aug  9 09:44:10 EEST 2004     root at host:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
telnet crashes if it's interrupted with CTRL + \ while trying to connect to remote host. This occurs very often on a slow link which induces connection timeouts. It also crashes if it's interrupted before resolving the remote hostname (also connection related, I guess)
>How-To-Repeat:
1. open a port on a remote system
2. filter that port dropping packets and try to connect there using telnet
3. CTRL + \ crashes it

I got 2 types of crash:
a. in connect () if it can't connect:
(gdb) bt
#0  0x28227bec in connect () from /usr/lib/libc.so.4
#1  0x804d0b0 in free ()
#2  0x804e0c2 in free ()
#3  0x8049e1e in free ()

b. in kevent () if it can't resolve
(gdb) bt
#0  0x28226c6c in kevent () from /usr/lib/libc.so.4
#1  0x28239461 in res_send () from /usr/lib/libc.so.4
#2  0x28240682 in getaddrinfo () from /usr/lib/libc.so.4
#3  0x28240b3d in getaddrinfo () from /usr/lib/libc.so.4
#4  0x282408a2 in getaddrinfo () from /usr/lib/libc.so.4
#5  0x28240088 in getaddrinfo () from /usr/lib/libc.so.4
#6  0x2823eda7 in getaddrinfo () from /usr/lib/libc.so.4
#7  0x2823ea2f in getaddrinfo () from /usr/lib/libc.so.4
#8  0x804cb96 in free ()
#9  0x804e0c2 in free ()
#10 0x8049e1e in free ()

>Fix:
None known
>Release-Note:
>Audit-Trail:
>Unformatted: