mip_test.c http fetch (#1851)

* Update mip_test.c

* Adding mip_free() function.

* Adding mip_free() function.

* Added MIP free.

* Fixed C++ builds.

* Proper C/C++ struct initialization.

* Squashed commit of the following:

commit 7ba68dd20d
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Wed Nov 16 16:19:50 2022 +0100

    Proper C/C++ struct initialization.

commit aeab3ef7ac
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 17:09:29 2022 +0100

    Fixed C++ builds.

commit 2afd529107
Merge: 14710b81 f8445a4c
Author: jfsimon1981 <jfsimon1981@gmail.com>
Date:   Tue Nov 15 11:33:56 2022 +0100

    Merge branch 'cesanta:master' into master

commit 14710b81e4
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 11:07:15 2022 +0100

    Added MIP free.

commit 6393cd149d
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 11:06:44 2022 +0100

    Adding mip_free() function.

commit feee81b733
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 11:05:55 2022 +0100

    Adding mip_free() function.

commit f8445a4c85
Merge: a39b7ddb 71f5be01
Author: Sergio R. Caprile <scaprile@users.noreply.github.com>
Date:   Fri Nov 11 20:42:38 2022 -0300

    Merge pull request #1853 from cesanta/tibaremetaltest

    Update test.yml

commit 71f5be011b
Author: Sergio R. Caprile <scaprile@users.noreply.github.com>
Date:   Fri Nov 11 20:15:01 2022 -0300

    Update test.yml

commit b53d3cf032
Merge: 7a71038a a39b7ddb
Author: jfsimon1981 <jfsimon1981@gmail.com>
Date:   Fri Nov 11 16:10:53 2022 +0100

    Merge branch 'cesanta:master' into master

commit 7a71038a27
Author: jfsimon1981 <jfsimon1981@gmail.com>
Date:   Fri Nov 11 16:09:22 2022 +0100

    Update mip_test.c

commit a39b7ddbac
Author: cpq <valenok@gmail.com>
Date:   Fri Nov 11 15:03:48 2022 +0000

    Fix fuzzer use-after-poison READ 1

* Squashed commit of the following:

commit 192ae56ece
Merge: 7b0509c8 7ba68dd2
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Wed Nov 16 17:44:03 2022 +0100

    Merge branch 'master' of https://github.com/jfsimon1981/mongoose

commit 7b0509c878
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Wed Nov 16 17:43:33 2022 +0100

    Squashed commit of the following:

    commit 7ba68dd20d
    Author: Jean-Francois Simon <jfsimon@startmail.com>
    Date:   Wed Nov 16 16:19:50 2022 +0100

        Proper C/C++ struct initialization.

    commit aeab3ef7ac
    Author: Jean-Francois Simon <jfsimon@startmail.com>
    Date:   Tue Nov 15 17:09:29 2022 +0100

        Fixed C++ builds.

    commit 2afd529107
    Merge: 14710b81 f8445a4c
    Author: jfsimon1981 <jfsimon1981@gmail.com>
    Date:   Tue Nov 15 11:33:56 2022 +0100

        Merge branch 'cesanta:master' into master

    commit 14710b81e4
    Author: Jean-Francois Simon <jfsimon@startmail.com>
    Date:   Tue Nov 15 11:07:15 2022 +0100

        Added MIP free.

    commit 6393cd149d
    Author: Jean-Francois Simon <jfsimon@startmail.com>
    Date:   Tue Nov 15 11:06:44 2022 +0100

        Adding mip_free() function.

    commit feee81b733
    Author: Jean-Francois Simon <jfsimon@startmail.com>
    Date:   Tue Nov 15 11:05:55 2022 +0100

        Adding mip_free() function.

    commit f8445a4c85
    Merge: a39b7ddb 71f5be01
    Author: Sergio R. Caprile <scaprile@users.noreply.github.com>
    Date:   Fri Nov 11 20:42:38 2022 -0300

        Merge pull request #1853 from cesanta/tibaremetaltest

        Update test.yml

    commit 71f5be011b
    Author: Sergio R. Caprile <scaprile@users.noreply.github.com>
    Date:   Fri Nov 11 20:15:01 2022 -0300

        Update test.yml

    commit b53d3cf032
    Merge: 7a71038a a39b7ddb
    Author: jfsimon1981 <jfsimon1981@gmail.com>
    Date:   Fri Nov 11 16:10:53 2022 +0100

        Merge branch 'cesanta:master' into master

    commit 7a71038a27
    Author: jfsimon1981 <jfsimon1981@gmail.com>
    Date:   Fri Nov 11 16:09:22 2022 +0100

        Update mip_test.c

    commit a39b7ddbac
    Author: cpq <valenok@gmail.com>
    Date:   Fri Nov 11 15:03:48 2022 +0000

        Fix fuzzer use-after-poison READ 1

commit 7ba68dd20d
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Wed Nov 16 16:19:50 2022 +0100

    Proper C/C++ struct initialization.

commit aeab3ef7ac
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 17:09:29 2022 +0100

    Fixed C++ builds.

commit 2afd529107
Merge: 14710b81 f8445a4c
Author: jfsimon1981 <jfsimon1981@gmail.com>
Date:   Tue Nov 15 11:33:56 2022 +0100

    Merge branch 'cesanta:master' into master

commit 14710b81e4
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 11:07:15 2022 +0100

    Added MIP free.

commit 6393cd149d
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 11:06:44 2022 +0100

    Adding mip_free() function.

commit feee81b733
Author: Jean-Francois Simon <jfsimon@startmail.com>
Date:   Tue Nov 15 11:05:55 2022 +0100

    Adding mip_free() function.

commit f8445a4c85
Merge: a39b7ddb 71f5be01
Author: Sergio R. Caprile <scaprile@users.noreply.github.com>
Date:   Fri Nov 11 20:42:38 2022 -0300

    Merge pull request #1853 from cesanta/tibaremetaltest

    Update test.yml

commit 71f5be011b
Author: Sergio R. Caprile <scaprile@users.noreply.github.com>
Date:   Fri Nov 11 20:15:01 2022 -0300

    Update test.yml

commit b53d3cf032
Merge: 7a71038a a39b7ddb
Author: jfsimon1981 <jfsimon1981@gmail.com>
Date:   Fri Nov 11 16:10:53 2022 +0100

    Merge branch 'cesanta:master' into master

commit a39b7ddbac
Author: cpq <valenok@gmail.com>
Date:   Fri Nov 11 15:03:48 2022 +0000

    Fix fuzzer use-after-poison READ 1

Co-authored-by: Jean-Francois Simon <jfsimon@startmail.com>

mip/mip.c

@@ -478,7 +478,7 @@ static size_t tx_tcp(struct mip_if *ifp, uint32_t dst_ip, uint8_t flags,
   struct ip *ip = tx_ip(ifp, 6, ifp->ip, dst_ip, sizeof(struct tcp) + len);
   struct tcp *tcp = (struct tcp *) (ip + 1);
   memset(tcp, 0, sizeof(*tcp));
-  memmove(tcp + 1, buf, len);
+  if (buf != NULL && len) memmove(tcp + 1, buf, len);
   tcp->sport = sport;
   tcp->dport = dport;
   tcp->seq = seq;
@@ -845,6 +845,11 @@ void mip_init(struct mg_mgr *mgr, struct mip_if *ifp) {
   }
 }
 
+void mip_free(struct mip_if * ifp) {
+    free((char *)ifp->rx.ptr);
+    free((char *)ifp->tx.ptr);
+}
+
 int mg_mkpipe(struct mg_mgr *m, mg_event_handler_t fn, void *d, bool udp) {
   (void) m, (void) fn, (void) d, (void) udp;
   MG_ERROR(("Not implemented"));

mip/mip.h

@@ -50,6 +50,7 @@ struct mip_if {
 };
 
 void mip_init(struct mg_mgr *, struct mip_if *);
+void mip_free(struct mip_if *);
 
 extern struct mip_driver mip_driver_stm32;
 extern struct mip_driver mip_driver_enc28j60;