[lwip-devel] [bug #35574] Lockup in httpd (the older non-SSI/CGI httpd)

[Bill Auerbach]

URL:
  <http://savannah.nongnu.org/bugs/?35574>

                 Summary: Lockup in httpd (the older non-SSI/CGI httpd)
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: billauerbach
            Submitted on: Mon 20 Feb 2012 06:10:47 PM EST
                Category: Contrib
                Severity: 3 - Normal
              Item Group: Crash Error
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.0

    _______________________________________________________

Details:

This is for the older version httpd that may be included with 1.4.1.  This may
also be useful if it's in use by those not using the latest.

Bug: send_data under what appears to be a time dependent condition will call
tcp_write with arg=NULL and len=0.  This causes an LWIP_ERROR halt error
(programmer violates API).  One could argue that with len=0 it never access
the NULL pointer and tcp_write could just return if len==0.  OTOH send_data
could include a test for len==0 and simply return and not call tcp_write. In
any case, this caused my program to hang (fortunately I was in a debugger and
knew why).




    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/bugs/?35574>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.nongnu.org/