Re: [lwip-users] makefs and mem_free errors

[Mike Spenard]

Correct, I misspoke... I simply meant 'generated' fsdata.c rather than
compiled.

I traced the "mem_free: mem->used" bomb out to the 404.html missing from
fsdata.c
The http_get_404_file() function checks for it missing:

     if (err != ERR_OK) {
        /* 404.htm doesn't exist either. Indicate to the caller that it
should
         * send back a default 404 page.
         */
        *uri = NULL;
        return NULL;

...however, http_find_file() doesn’t have any code to properly handle that
NULL:

    } else {
      file = http_get_404_file(hs, &uri);
    }

I assume this is why I end up with a pbuf structure of heap allocated by
never flagged as Used. Which causes free_mem() to bomb out  ...?

I'm a new player here, so has this been fixed in newer code than NXP
provided me with? Or am I misunderstanding things?

Mike


-----Original Message-----
From: lwip-users <address@hidden> On Behalf
Of address@hidden
Sent: Tuesday, April 2, 2019 2:29 PM
To: Mailing list for lwIP users <address@hidden>
Subject: Re: [lwip-users] makefs and mem_free errors

Am 02.04.2019 um 14:14 schrieb Mike Spenard:
> Hi Gents,
>
> New to LwIP so I apologize if this is a common topic. I’m trying to 
> get running on lwip-httpd.
>
> My first issue is with compiling an fsdata.c. I always get errors 
> saying headers cannot be found despite using makefsfile.exe without 
> the -h option. The only work-around was to set 
> LWIP_HTTPD_DYNAMIC_HEADERS and to use the -h option with 
> makefsfile.exe

Well, you don't compile fsdata.c: it gets included by fs.c.

>
> Having done that, my page now loads. But then httpd immediately bombs 
> out with a “mem_free: mem->used” assert()  error.

A double-free? I don't think that's a httpd related issue. Is any other
application running on your lwIP without problems?

Regards,
Simon

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