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[lwip-devel] [bug #61126] ram_end write outside heap...

From: Dag Midling Larsen
Subject: [lwip-devel] [bug #61126] ram_end write outside heap...
Date: Wed, 8 Sep 2021 06:17:02 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 Edg/93.0.961.38 
URL:
  <https://savannah.nongnu.org/bugs/?61126>

                 Summary: ram_end write outside heap...
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dml_sw
            Submitted on: Wed 08 Sep 2021 10:17:01 AM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: Other

    _______________________________________________________

Details:

Hi

LwIp version 2.1.2., mem.c, lines [530, 534]:
  /* initialize the end of the heap */
  ram_end = ptr_to_mem(MEM_SIZE_ALIGNED);
  ram_end->used = 1;
  ram_end->next = MEM_SIZE_ALIGNED;
  ram_end->prev = MEM_SIZE_ALIGNED;

These lines writes 9 bytes beyond heap allocated by application.

Regards,
Dag




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