[lwip-devel] [bug #53680] Bug in mem.c when LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT is active

[Dirk Ziegelmeier]

URL:
  <http://savannah.nongnu.org/bugs/?53680>

                 Summary: Bug in mem.c when
LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT is active
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dziegel
            Submitted on: Tue 17 Apr 2018 06:36:41 PM 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: git head

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Details:

Reported via EMail:

Hi,

I just tracked down a bug in mem.c that leads to sporadic memory
corruption when LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT is active.

I think lfree needs to be declared volatile (static struct mem *
volatile lfree). Otherwise the compiler might use the old value of lfree
at the top of the for-loop in mem_malloc.

regards, Matthias
-- 
Matthias Pfaller




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