Fix potential reentrancy problems in chan_sip.
Asterisk v1.8 and later was not as vulnerable to this issue. * Made find_call() lock each private as it processes the found dialogs. (Primary cause of ABE-2876) * Made the other functions that traverse the dialogs container lock each private as it examines them. * Fix race condition in sip_call() if the thread that sent the INVITE is held up long enough for a response to be processed. The p->initid for the INVITE retransmission could be added after it was canceled by the response processing. * Made __sip_destroy() clean up resource pointers after freeing. This is primarily defensive in case someone has a stale private pointer. * Removed redundant memset() in reqprep(). The call to init_req() already does the memset() and is the first reference to req in reqprep(). * Removed useless set of req.method in transmit_invite(). The calls to initreqprep() and reqprep() have to do this because they memset() the req. JIRA ABE-2876 .......... Merged -r373423 from https://origsvn.digium.com/svn/asterisk/be/branches/C.3-bier ........ Merged revisions 373424 from http://svn.asterisk.org/svn/asterisk/branches/1.8 ........ Merged revisions 373466 from http://svn.asterisk.org/svn/asterisk/branches/10 ........ Merged revisions 373469 from http://svn.asterisk.org/svn/asterisk/branches/11 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@373471 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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@ -6074,9 +6074,10 @@ static int sip_call(struct ast_channel *ast, const char *dest, int timeout)
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}
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xmitres = transmit_invite(p, SIP_INVITE, 1, 2, uri);
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sip_pvt_unlock(p);
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if (xmitres == XMIT_ERROR)
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if (xmitres == XMIT_ERROR) {
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sip_pvt_unlock(p);
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return -1;
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}
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p->invitestate = INV_CALLING;
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/* Initialize auto-congest time */
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@ -6084,6 +6085,7 @@ static int sip_call(struct ast_channel *ast, const char *dest, int timeout)
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dialog_unref(_data, "dialog ptr dec when SCHED_REPLACE del op succeeded"),
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dialog_unref(p, "dialog ptr dec when SCHED_REPLACE add failed"),
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dialog_ref(p, "dialog ptr inc when SCHED_REPLACE add succeeded") );
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sip_pvt_unlock(p);
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}
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return res;
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}
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@ -6187,6 +6189,7 @@ void __sip_destroy(struct sip_pvt *p, int lockowner, int lockdialoglist)
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if (p->mwi) {
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p->mwi->call = NULL;
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p->mwi = NULL;
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}
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if (dumphistory)
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@ -6197,30 +6200,38 @@ void __sip_destroy(struct sip_pvt *p, int lockowner, int lockdialoglist)
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ao2_ref(p->options->outboundproxy, -1);
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}
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ast_free(p->options);
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p->options = NULL;
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}
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if (p->notify) {
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ast_variables_destroy(p->notify->headers);
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ast_free(p->notify->content);
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ast_free(p->notify);
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p->notify = NULL;
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}
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if (p->rtp) {
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ast_rtp_instance_destroy(p->rtp);
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p->rtp = NULL;
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}
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if (p->vrtp) {
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ast_rtp_instance_destroy(p->vrtp);
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p->vrtp = NULL;
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}
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if (p->trtp) {
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ast_rtp_instance_destroy(p->trtp);
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p->trtp = NULL;
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}
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if (p->udptl)
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if (p->udptl) {
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ast_udptl_destroy(p->udptl);
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p->udptl = NULL;
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}
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if (p->refer) {
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if (p->refer->refer_call) {
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p->refer->refer_call = dialog_unref(p->refer->refer_call, "unref dialog p->refer->refer_call");
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}
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ast_string_field_free_memory(p->refer);
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ast_free(p->refer);
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p->refer = NULL;
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}
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if (p->route) {
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free_old_route(p->route);
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@ -6274,6 +6285,7 @@ void __sip_destroy(struct sip_pvt *p, int lockowner, int lockdialoglist)
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ast_string_field_free_memory(p);
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ast_cc_config_params_destroy(p->cc_params);
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p->cc_params = NULL;
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if (p->epa_entry) {
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ao2_ref(p->epa_entry, -1);
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@ -8622,10 +8634,34 @@ static enum match_req_res match_req_to_dialog(struct sip_pvt *sip_pvt_ptr, struc
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static void forked_invite_init(struct sip_request *req, const char *new_theirtag, struct sip_pvt *original, struct ast_sockaddr *addr)
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{
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struct sip_pvt *p;
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const char *callid;
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struct ast_callid *logger_callid;
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if (!(p = sip_alloc(original->callid, addr, 1, SIP_INVITE, req, original->logger_callid))) {
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sip_pvt_lock(original);
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callid = ast_strdupa(original->callid);
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logger_callid = original->logger_callid;
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if (logger_callid) {
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ast_callid_ref(logger_callid);
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}
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sip_pvt_unlock(original);
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p = sip_alloc(callid, addr, 1, SIP_INVITE, req, logger_callid);
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if (logger_callid) {
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ast_callid_unref(logger_callid);
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}
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if (!p) {
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return; /* alloc error */
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}
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/* Lock p and original private structures. */
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sip_pvt_lock(p);
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while (sip_pvt_trylock(original)) {
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/* Can't use DEADLOCK_AVOIDANCE since p is an ao2 object */
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sip_pvt_unlock(p);
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sched_yield();
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sip_pvt_lock(p);
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}
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p->invitestate = INV_TERMINATED;
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p->ocseq = original->ocseq;
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p->branch = original->branch;
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@ -8637,6 +8673,9 @@ static void forked_invite_init(struct sip_request *req, const char *new_theirtag
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ast_string_field_set(p, uri, original->uri);
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ast_string_field_set(p, our_contact, original->our_contact);
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ast_string_field_set(p, fullcontact, original->fullcontact);
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sip_pvt_unlock(original);
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parse_ok_contact(p, req);
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build_route(p, req, 1, 0);
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@ -8644,6 +8683,7 @@ static void forked_invite_init(struct sip_request *req, const char *new_theirtag
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transmit_request(p, SIP_BYE, 0, XMIT_RELIABLE, TRUE);
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pvt_set_needdestroy(p, "forked request"); /* this dialog will terminate once the BYE is responed to or times out. */
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sip_pvt_unlock(p);
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dialog_unref(p, "setup forked invite termination");
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}
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@ -8823,7 +8863,9 @@ static struct sip_pvt *find_call(struct sip_request *req, struct ast_sockaddr *a
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/* Iterate a list of dialogs already matched by Call-id */
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while (iterator && (sip_pvt_ptr = ao2_iterator_next(iterator))) {
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sip_pvt_lock(sip_pvt_ptr);
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found = match_req_to_dialog(sip_pvt_ptr, &args);
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sip_pvt_unlock(sip_pvt_ptr);
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switch (found) {
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case SIP_REQ_MATCH:
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@ -8847,6 +8889,7 @@ static struct sip_pvt *find_call(struct sip_request *req, struct ast_sockaddr *a
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case SIP_REQ_NOT_MATCH:
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default:
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dialog_unref(sip_pvt_ptr, "pvt did not match incoming SIP msg, unref from search");
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break;
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}
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}
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if (iterator) {
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@ -11394,8 +11437,6 @@ static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, ui
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int is_strict = FALSE; /*!< Strict routing flag */
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int is_outbound = ast_test_flag(&p->flags[0], SIP_OUTGOING); /* Session direction */
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memset(req, 0, sizeof(struct sip_request));
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snprintf(p->lastmsg, sizeof(p->lastmsg), "Tx: %s", sip_methods[sipmethod].text);
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if (!seqno) {
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@ -13052,19 +13093,21 @@ static void copy_request(struct sip_request *dst, const struct sip_request *src)
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/* copy the entire request then restore the original data and content
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* members from the dst request */
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memcpy(dst, src, sizeof(*dst));
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*dst = *src;
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dst->data = duplicate;
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dst->content = duplicate_content;
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/* copy the data into the dst request */
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if (!dst->data && !(dst->data = ast_str_create(ast_str_strlen(src->data) + 1)))
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if (!dst->data && !(dst->data = ast_str_create(ast_str_strlen(src->data) + 1))) {
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return;
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}
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ast_str_copy_string(&dst->data, src->data);
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/* copy the content into the dst request (if it exists) */
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if (src->content) {
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if (!dst->content && !(dst->content = ast_str_create(ast_str_strlen(src->content) + 1)))
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if (!dst->content && !(dst->content = ast_str_create(ast_str_strlen(src->content) + 1))) {
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return;
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}
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ast_str_copy_string(&dst->content, src->content);
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}
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}
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@ -13565,8 +13608,7 @@ static int transmit_invite(struct sip_pvt *p, int sipmethod, int sdp, int init,
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{
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struct sip_request req;
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struct ast_variable *var;
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req.method = sipmethod;
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if (init) {/* Bump branch even on initial requests */
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p->branch ^= ast_random();
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p->invite_branch = p->branch;
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@ -19833,13 +19875,18 @@ static int show_chanstats_cb(void *__cur, void *__arg, int flags)
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char durbuf[10];
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int duration;
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int durh, durm, durs;
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struct ast_channel *c = cur->owner;
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struct ast_channel *c;
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struct __show_chan_arg *arg = __arg;
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int fd = arg->fd;
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sip_pvt_lock(cur);
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c = cur->owner;
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if (cur->subscribed != NONE) /* Subscriptions */
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if (cur->subscribed != NONE) {
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/* Subscriptions */
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sip_pvt_unlock(cur);
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return 0; /* don't care, we scan all channels */
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}
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if (!cur->rtp) {
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if (sipdebug) {
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invitestate2string[cur->invitestate].desc,
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"-- No RTP active");
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}
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sip_pvt_unlock(cur);
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return 0; /* don't care, we scan all channels */
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}
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if (ast_rtp_instance_get_stats(cur->rtp, &stats, AST_RTP_INSTANCE_STAT_ALL)) {
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sip_pvt_unlock(cur);
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ast_log(LOG_WARNING, "Could not get RTP stats.\n");
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return 0;
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}
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@ -19882,6 +19931,7 @@ static int show_chanstats_cb(void *__cur, void *__arg, int flags)
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stats.txjitter
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);
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arg->numchans++;
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sip_pvt_unlock(cur);
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return 0; /* don't care, we scan all channels */
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}
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{
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struct sip_pvt *cur = __cur;
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struct __show_chan_arg *arg = __arg;
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const struct ast_sockaddr *dst = sip_real_dst(cur);
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const struct ast_sockaddr *dst;
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sip_pvt_lock(cur);
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dst = sip_real_dst(cur);
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/* XXX indentation preserved to reduce diff. Will be fixed later */
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if (cur->subscribed == NONE && !arg->subscriptions) {
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/* set if SIP transfer in progress */
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@ -20262,6 +20315,7 @@ static int show_channels_cb(void *__cur, void *__arg, int flags)
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);
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arg->numchans++;
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}
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sip_pvt_unlock(cur);
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return 0; /* don't care, we scan all channels */
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}
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