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Matthew Jordan f39c2a40f9 Fix crash in chan_sip when a core initiated op occurs at the same time as a BYE ... When a BYE request is processed in chan_sip, the current SIP dialog is detached from its associated Asterisk channel structure. The tech_pvt pointer in the channel object is set to NULL, and the dialog persists for an RFC mandated period of time to handle re-transmits. While this process occurs, the channel is locked (which is good). Unfortunately, operations that are initiated externally have no way of knowing that the channel they've just obtained (which is still valid) and that they are attempting to lock is about to have its tech_pvt pointer removed. By the time they obtain the channel lock and call the channel technology callback, the tech_pvt is NULL. This patch adds a few checks to some channel callbacks that make sure the tech_pvt isn't NULL before using it. Prime offenders were the DTMF digit callbacks, which would crash if AMI initiated a DTMF on the channel at the same time as a BYE was received from the UA. This patch also adds checks on sip_transfer (as AMI can also cause a callback into this function), as well as sip_indicate (as lots of things can queue an indication onto a channel). Review: https://reviewboard.asterisk.org/r/2434/ (closes issue ASTERISK-20225) Reported by: Jeff Hoppe git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@385170 65c4cc65-6c06-0410-ace0-fbb531ad65f3		13 years ago
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h323	Comment out a rule that likes to run implicitly unnecessarily, breaking builds	16 years ago
misdn	chan_misdn: Fix sending RELEASE_COMPLETE in response to SETUP.	13 years ago
sip	AST-2013-003: Prevent username disclosure in SIP channel driver	13 years ago
Makefile	Extract sig_ss7 out of chan_dahdi.	16 years ago
chan_agent.c	chan_agent: Prevent multiple channels from logging in as the same agent.	13 years ago
chan_alsa.c	Clean up and ensure proper usage of alloca()	14 years ago
chan_bridge.c	Introduce <support_level> tags in MODULEINFO.	15 years ago
chan_console.c	Updated SIP 484 handling; added Incomplete control frame	15 years ago
chan_dahdi.c	chan_dahdi: Add inband_on_proceeding compatibility option.	13 years ago
chan_gtalk.c	Clean up and ensure proper usage of alloca()	14 years ago
chan_h323.c	Correct some 'set-but-not-used' variable warnings.	14 years ago
chan_iax2.c	Prevent deadlock in chan_iax2 when attempting to set caller ID	13 years ago
chan_jingle.c	Set the sin_family on the bind address socket during initialization	13 years ago
chan_local.c	Prevent exhaustion of system resources through exploitation of event cache	13 years ago
chan_mgcp.c	Add missing newlines to CLI logging	14 years ago
chan_misdn.c	chan_misdn: Fix compile error.	13 years ago
chan_multicast_rtp.c	Introduce <support_level> tags in MODULEINFO.	15 years ago
chan_nbs.c	Introduce <support_level> tags in MODULEINFO.	15 years ago
chan_oss.c	Fix misuses of asprintf throughout the code.	14 years ago
chan_phone.c	Introduce <support_level> tags in MODULEINFO.	15 years ago
chan_phone.h	…
chan_sip.c	Fix crash in chan_sip when a core initiated op occurs at the same time as a BYE	13 years ago
chan_skinny.c	Prevent exhaustion of system resources through exploitation of event cache	13 years ago
chan_unistim.c	Fix several unreleased mutex locks that cause problem with processing calls	13 years ago
chan_vpb.cc	chan_vpb: remove unused variables (gcc4.6)	15 years ago
console_board.c	Add support-level indications to many more source files.	14 years ago
console_gui.c	Add support-level indications to many more source files.	14 years ago
console_video.c	Add support-level indications to many more source files.	14 years ago
console_video.h	…
iax2-parser.c	Add support-level indications to many more source files.	14 years ago
iax2-parser.h	Remove built-in AES code and use optional_api instead	16 years ago
iax2-provision.c	iax2-provision: Fix improper return on failed cache retrieval	14 years ago
iax2-provision.h	…
iax2.h	Correct the number of available call numbers in IAX2.	13 years ago
misdn_config.c	Add support-level indications to many more source files.	14 years ago
sig_analog.c	Fix misuses of timeouts throughout the code.	14 years ago
sig_analog.h	Fix the analog dial *0 flash-hook of bridged peer feature.	14 years ago
sig_pri.c	chan_dahdi: Add inband_on_proceeding compatibility option.	13 years ago
sig_pri.h	chan_dahdi: Add inband_on_proceeding compatibility option.	13 years ago
sig_ss7.c	chan_dahdi/SS7: Made reject incoming call for an in-alarm or blocked channel.	13 years ago
sig_ss7.h	Setup DSP when SS7 call is connected or early media is available.	14 years ago
vcodecs.c	Add support-level indications to many more source files.	14 years ago
vgrabbers.c	Add support-level indications to many more source files.	14 years ago