>Number: 491
>Category: mod_proxy
>Synopsis: Segmentation fault with unresolvable ProxyBlock hostname
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: apache (Apache HTTP Project)
>State: open
>Class: sw-bug
>Submitter-Id: apache
>Arrival-Date: Sun Apr 27 17:00:01 1997
>Originator: [EMAIL PROTECTED]
>Organization:
apache
>Release: 1.2b8
>Environment:
Red Hat Linux 4.1
Linux kernel 2.0.27
libc 5.3.12
gcc 2.7.2.1
>Description:
When ProxyBlock is given an unresolvable hostname, the daemon will crash. Here
is a backtrace from gdb:
#0 0x807ef37 in set_proxy_exclude (parms=0xbffff998, dummy=0x0,
arg=0x80a5604 "this.doesnt.exist") at mod_proxy.c:356
#1 0x8052288 in invoke_cmd (cmd=0x809a974, parms=0xbffff998, mconfig=0x0,
args=0xbfffd95c "") at http_config.c:580
#2 0x8052669 in handle_command (parms=0xbffff998, config=0x80a4634,
l=0xbfffd940 "ProxyBlock this.doesnt.exist") at http_config.c:677
#3 0x80526fc in srm_command_loop (parms=0xbffff998, config=0x80a4634)
at http_config.c:690
#4 0x80528c6 in process_resource_config (s=0x80a395c,
fname=0x80a4e5c "/etc/httpd/conf/httpd.conf", p=0x80a3934, ptemp=0x80a5944)
at http_config.c:770
#5 0x80531a9 in read_config (p=0x80a3934, ptemp=0x80a5944,
confname=0x809f8b0 "conf/httpd.conf") at http_config.c:1081
#6 0x804ed2b in main (argc=1, argv=0xbffffa54) at http_main.c:2267
#7 0x804a48b in ___crt_dummy__ ()
>How-To-Repeat:
Insert this into httpd.conf:
ProxyBlock this.doesnt.exist
This will cause the segmentation fault
>Fix:
The backtrace is indicating that the line causing the seg fault is:
new->addr.s_addr = 0;
(mod_proxy.c:356)
This makes no sense to me (although I haven't checked out the code as carefully
as I should), and have a feeling that the problem is really in the
proxy_host2addr function call two lines above.
>Audit-Trail:
>Unformatted:
