buglwIP - A Lightweight TCP/IP stack - Bugs: bug #61525, altcp_tls: null dereference when...


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bug #61525: altcp_tls: null dereference when unable to alloc pcb in tcp_listen_input

Submitter:  Josh <inojosh>
Submitted:  Mon 22 Nov 2021 09:12:25 PM UTC
Category:  apps Severity:  3 - Normal
Item Group:  Crash Error Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Planned Release:  None
lwIP version:  2.1.3

Mon 22 Nov 2021 09:12:25 PM UTC, original submission:  

In tcp_listen_input, when a new PCB can't be created:

TCP_EVENT_ACCEPT(pcb, NULL, pcb->callback_arg, ERR_MEM, err);

leads to altcp_tcp_accept with new_tpcb as NULL.
There are no checks for this, and the NULL dereference eventually occurs in altcp_tcp_setup_callbacks.

Josh <inojosh>


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