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res_pjsip: Prevent crashes when PJPROJECT presents an rdata with no message

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When a message that exceeds the PJ_MAX_PKT_SIZE is sent over a reliable
transport, it is possible (although it shouldn't occur) for pjproject to pass
up an rdata object with a NULL msg in the msg_info. Needless to say, things
that attempt to dereference this are in for a rough ride.

In particular, this caused crashes in three different locations, all of which
are 'low level' enough to intercept an rdata object early in processing:

(1) res_pjsip_logger
(2) res_hep_pjsip
(3) res_pjsip/distributor

Anything that can intercept an rdata object before res_pjsip/distributor should
be defensive when looking at the received packet.

#SIPit31

ASTERISK-24369 #close
Reported by: Matt Jordan
........

Merged revisions 424618 from http://svn.asterisk.org/svn/asterisk/branches/12
........

Merged revisions 424619 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@424620 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2014-10-06 00:31:48 +00:00
parent f27f41a288
commit 45b7b474ac
3 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
res/res_pjsip/pjsip_distributor.c
View File

@@ -100,6 +100,10 @@ static pjsip_dialog *find_dialog(pjsip_rx_data *rdata)
pj_str_t *local_tag;
pj_str_t *remote_tag;
if (!rdata->msg_info.msg) {
return NULL;
}
if (rdata->msg_info.msg->type == PJSIP_REQUEST_MSG) {
local_tag = &rdata->msg_info.to->tag;
remote_tag = &rdata->msg_info.from->tag;