ss_thread calls pri_grab without lock during overlap dial

Recent changes to chan_dahdi with relation to overlap dialing call
pri_grab without first obtaining a lock.

(closes issue #17414)
Reported by: pdf
Patches:
      bug17414.patch uploaded by jpeeler (license 325)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@272446 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index 9cd089a93df12a14f791a77a516a4a7021a3fa66..9eef9e3c199154895d6dd6583793425f643303b5 100644 (file)
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -6048,6 +6048,7 @@ static void *ss_thread(void *data)
                                ast_dsp_digitreset(p->dsp);
                        }
                        if (p->pri->overlapdial & DAHDI_OVERLAPDIAL_INCOMING) {
+                               ast_mutex_lock(&p->lock);
                                if (p->pri->pri) {              
                                        if (!pri_grab(p, p->pri)) {
                                                pri_proceeding(p->pri->pri, p->call, PVT_TO_CHANNEL(p), 0);
@@ -6057,6 +6058,7 @@ static void *ss_thread(void *data)
                                                ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
                                        }
                                }
+                               ast_mutex_unlock(&p->lock);
                        }
                        dahdi_enable_ec(p);
                        ast_setstate(chan, AST_STATE_RING);