[lwip-devel] [bug #17922] mem_malloc bug

[anonymous]

URL:
  <http://savannah.nongnu.org/bugs/?17922>

                 Summary: mem_malloc bug
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: None
            Submitted on: Thursday 10/05/2006 at 21:29 UTC
                Category: None
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open

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Details:

I've run across what I believe to be a bug in mem_malloc.

Basically, if you allocate all the memory in multiple blocks, then free the
first block you allocated, you cannot allocate a new block of the same size.

The following code fails:

test() {
 void * ptr1
 void * cur;

 /** allocate the first block */
 ptr1 = mem_malloc(200);
 ASSERT(ptr1); /* <--- this succeeds */

 /** allocate all the remaining blocks */
 do {
   cur = mem_malloc(200);
 } while (cur);

 /** free the first block */
 mem_free(ptr1);

 /** now attempt to re-allocate the 200 bytes just freed */
 ptr1 = mem_malloc(200);
 ASSERT(ptr1);  /* <---- this FAILS */
}

Please refer to this thread for more information:
http://lists.nongnu.org/archive/html/lwip-users/2006-10/msg00001.html






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