[lwip-devel] [bug #36645] Calling dhcp_release before dhcp_start dereferences NULL

[Mason]

URL:
  <http://savannah.nongnu.org/bugs/?36645>

                 Summary: Calling dhcp_release before dhcp_start dereferences
NULL
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: mason
            Submitted on: Wed 13 Jun 2012 07:43:01 AM GMT
                Category: None
                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

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Details:

I suppose this should be considered a programming error, but
I'm not sure it should bring the system down.

Calling dhcp_release when dhcp_start has never been called
causes a NULL dereference (because the dhcp struct has never
been allocated).

dhcp_release calls dhcp_set_state(dhcp, DHCP_OFF);
dhcp_state( ) reads dhcp->state.
If dhcp is NULL : bam.





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