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Alexandre Fournier 6b703b12d5 format_cap: guard against NULL src in *_from_cap helpers 
ast_format_cap_append_from_cap() and ast_format_cap_replace_from_cap()
dereference 'src' (src->preference_order) without checking it for NULL.

A dummy channel allocated with ast_dummy_channel_alloc() never sets a
native-format capability, so ast_channel_nativeformats() returns NULL on
such channels. When CHANNEL(audionativeformat) / CHANNEL(videonativeformat)
is evaluated against a dummy channel (e.g. via ARI channelvars during a
Stasis VarSet event raised while app_voicemail builds the notification
email on a dummy channel), func_channel_read() passes that NULL straight
into ast_format_cap_append_from_cap(), causing a NULL dereference at
offset 0x28 and a SIGSEGV.

Guard both helpers against a NULL source. A NULL source simply means
"no formats to copy", so appending/replacing nothing is the correct
no-op behaviour. This also protects all other callers.

Fixes https://github.com/asterisk/asterisk/issues/1992

AI disclosure: this was generated using Claude Opus 4.8, tested to fix the issue. Not sure if it is the *right* way to do it.
2026-06-25 23:39:39 +00:00
..
stdtime
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
.gitignore
…
abstract_jb.c
abstract_jb.c: Remove timerfd from channel when disabling jitter buffer
2026-06-01 16:07:53 +00:00
acl.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
adsi.c
…
alaw.c
…
alertpipe.c
…
aoc.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
app.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
ast_expr2.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
ast_expr2.fl
general: Fix broken links.
2023-12-08 13:11:48 +00:00
ast_expr2.h
ael: Regenerate lexers and parsers.
2023-04-03 07:13:57 -05:00
ast_expr2.y
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
ast_expr2f.c
general: Fix broken links.
2023-12-08 13:11:48 +00:00
asterisk.c
extension_state: Add new extension state API.
2026-06-11 18:30:55 +00:00
asterisk.dynamics
…
asterisk.exports.in
Scope Tracing: A new facility for tracing scope enter/exit
2020-06-02 11:35:07 -05:00
astfd.c
astfd.c: Avoid calling fclose with NULL argument.
2024-09-25 18:27:15 +00:00
astmm.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
astobj2_container_private.h
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
astobj2_container.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
astobj2_global.c
core: Fix ABI mismatch of ao2_global_obj.
2019-09-23 07:35:48 -04:00
astobj2_hash.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
astobj2_private.h
…
astobj2_rbtree.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
astobj2.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
audiohook.c
audiohook.c: Ensure correct AO2 reference is dereffed.
2025-09-11 14:47:32 +00:00
autochan.c
…
autoservice.c
autoservice: Do not sleep if autoservice_stop is called within autoservice thread
2024-09-09 23:17:15 +00:00
backtrace.c
build: Fix another GCC discarded-qualifiers const error.
2026-02-18 19:30:12 +00:00
bridge_after.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
bridge_basic.c
main: Explicitly mark case statement fallthrough as such.
2025-11-12 22:10:44 +00:00
bridge_channel.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
bridge_roles.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
bridge.c
res ari: Add attachable states to Channels and Bridges
2026-06-03 22:54:43 +00:00
bucket.c
docs: Various XML fixes
2025-01-16 15:32:48 +00:00
buildinfo.c
…
callerid.c
callerid: fix signed char causing crash in MDMF parser
2026-03-31 16:54:57 +00:00
ccss.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
cdr.c
cdr: add CANCEL dispostion in CDR
2025-08-06 15:37:46 +00:00
cel.c
CDR/CEL Custom Performance Improvements
2026-03-02 16:43:24 +00:00
channel_internal_api.c
res ari: Add attachable states to Channels and Bridges
2026-06-03 22:54:43 +00:00
channel_private.h
res ari: Add attachable states to Channels and Bridges
2026-06-03 22:54:43 +00:00
channel.c
res ari: Add attachable states to Channels and Bridges
2026-06-03 22:54:43 +00:00
channelstorage_ao2_legacy.c
channelstorage: Allow storage driver read locking to be skipped.
2025-11-12 21:27:16 +00:00
channelstorage_cpp_map_name_id.cc
channelstorage_cpp_map_name_id: Fix get_by_name_prefix prefix match
2026-01-23 15:25:39 +00:00
channelstorage_makeopts.xml
channelstorage_makeopts.xml: Remove errant XML character.
2025-07-01 14:02:33 +00:00
channelstorage.c
channelstorage_cpp_map_name_id: Fix get_by_name_prefix prefix match
2026-01-23 15:25:39 +00:00
channelstorage.h
channelstorage: Allow storage driver read locking to be skipped.
2025-11-12 21:27:16 +00:00
chanvars.c
…
cli.c
cli.c: Allow 'channel request hangup' to accept patterns.
2026-01-13 16:03:24 +00:00
codec_builtin.c
codec_builtin: Use multiples of 20 for maximum_ms
2023-09-22 16:10:05 +00:00
codec.c
Reduce startup/shutdown verbose logging
2024-02-12 18:46:27 +00:00
config_options.c
config_options.c: Improve misleading warning.
2025-10-02 14:43:01 +00:00
config.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
conversions.c
conversions.c: Specify that we only want to parse decimal numbers.
2022-03-23 17:13:03 -05:00
core_local.c
ccss: Add option to ccss.conf to globally disable it.
2025-12-01 14:05:53 +00:00
core_unreal.c
ccss: Add option to ccss.conf to globally disable it.
2025-12-01 14:05:53 +00:00
crypt.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
cygload.c
…
data_buffer.c
res_rtp_asterisk: Free payload when error on insertion to data buffer
2020-04-15 13:56:40 -05:00
datastore.c
Geolocation: Base Asterisk Prereqs
2022-07-07 08:19:14 -05:00
db.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
devicestate.c
devicestate: Don't publish redundant device state messages.
2025-10-22 15:47:14 +00:00
dial.c
main/dial.c: Set channel hangup cause on timeout in handle_timeout_trip
2025-12-29 19:37:31 +00:00
dns_core.c
res_rtp_asterisk: Add option to control stun host resolution when TTL = 0
2026-05-19 21:11:24 +00:00
dns_naptr.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
dns_query_set.c
…
dns_recurring.c
res_rtp_asterisk: Add option to control stun host resolution when TTL = 0
2026-05-19 21:11:24 +00:00
dns_srv.c
Compiler fixes for gcc 10
2020-06-10 09:33:28 -05:00
dns_system_resolver.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
dns_test.c
progdocs: Fix for Doxygen, the hidden parts.
2021-12-02 10:37:38 -06:00
dns_tlsa.c
…
dns_txt.c
core/dns: Add system include required on FreeBSD
2020-04-28 13:05:55 -05:00
dns.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
dnsmgr.c
dnsmgr.c: dnsmgr_refresh() incorrectly flags change with DNS round-robin
2024-10-10 15:34:25 +00:00
dsp.c
dsp.c: Add support for detecting R2 signaling tones.
2026-03-03 22:07:20 +00:00
ecdisa.h
…
editline_compat.c
asterisk.c: Allow multi-byte characters on the Asterisk CLI.
2026-01-05 14:46:21 +00:00
editline_compat.h
asterisk.c: Allow multi-byte characters on the Asterisk CLI.
2026-01-05 14:46:21 +00:00
endpoints.c
endpoints: Allow access to latest snapshot directly.
2026-02-17 13:31:24 +00:00
enum.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
event.c
channel: Add multi-tenant identifier.
2024-08-12 15:21:31 +00:00
extension_state_autohints.c
extension_state: Add new extension state API.
2026-06-11 18:30:55 +00:00
extension_state_legacy.c
extension_state: Add new extension state API.
2026-06-11 18:30:55 +00:00
extension_state.c
extension_state: Add new extension state API.
2026-06-11 18:30:55 +00:00
features_config.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
features_config.h
…
features.c
Fix some doxygen, typos and whitespace
2025-09-22 17:39:09 +00:00
file.c
main/file: fix translated-frame write loop to use current frame
2026-03-03 21:51:46 +00:00
fixedjitterbuf.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
fixedjitterbuf.h
…
format_cache.c
Reduce startup/shutdown verbose logging
2024-02-12 18:46:27 +00:00
format_cap.c
format_cap: guard against NULL src in *_from_cap helpers
2026-06-25 23:39:39 +00:00
format_compatibility.c
codecs: Remove test-law.
2021-01-04 05:00:58 -06:00
format.c
Reduce startup/shutdown verbose logging
2024-02-12 18:46:27 +00:00
frame.c
frame.c: validate frame data length is less than samples when adjusting volume
2025-05-20 13:54:02 +00:00
framehook.c
…
fskmodem_float.c
build: Fix unused-but-set-variable warnings with gcc 16.
2026-02-25 13:25:14 +00:00
fskmodem_int.c
main: Spelling fixes
2021-11-15 17:33:27 -06:00
fskmodem.c
…
global_datastores.c
…
hashtab.c
…
heap.c
…
http.c
http: Escape error page text to prevent reflected XSS
2026-06-25 08:21:35 -06:00
image.c
Reduce startup/shutdown verbose logging
2024-02-12 18:46:27 +00:00
indications.c
Reduce startup/shutdown verbose logging
2024-02-12 18:46:27 +00:00
io.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
iostream.c
res_http_websocket: Add timeout to client handshakes.
2026-06-16 14:17:41 +00:00
jitterbuf.c
…
json.c
ARI: REST over Websocket
2025-04-02 12:16:35 +00:00
libasteriskpj.c
…
libasteriskssl.c
…
libasteriskssl.exports.in
…
loader.c
options: Change ast_options from ast_flags to ast_flags64.
2025-07-30 15:59:21 +00:00
lock.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
logger_category.c
Logging: Add debug logging categories
2020-10-02 12:58:18 -05:00
logger_doc.xml
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
logger.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
Makefile
build: remove pjsua, pjsystest, Python bindings and asterisk_malloc_debug stubs from pjproject dev build
2026-04-07 17:18:36 +00:00
manager_bridges.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
manager_channels.c
chan_pjsip: Add technology-specific off-nominal hangup cause to events.
2025-10-20 13:22:48 +00:00
manager_doc.xml
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
manager_endpoints.c
…
manager_mwi.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
manager_system.c
…
manager.c
manager: Use remote address in user error logging
2026-06-25 08:21:35 -06:00
max_forwards.c
…
md5.c
Prequisites for ARI Outbound Websockets
2025-04-21 13:29:27 +00:00
media_cache.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
media_index.c
…
message.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
mixmonitor.c
…
mwi.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
named_acl.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
named_locks.c
…
netsock2.c
…
optional_api.c
progdocs: Fix for Doxygen, the hidden parts.
2021-12-02 10:37:38 -06:00
options.c
options: Change ast_options from ast_flags to ast_flags64.
2025-07-30 15:59:21 +00:00
parking.c
…
pbx_app.c
docs: Add "Provided-by" to doc XML and CLI output.
2026-03-03 18:55:45 +00:00
pbx_builtins.c
pbx_builtins: Allow custom tone for WaitExten.
2025-09-04 15:03:40 +00:00
pbx_functions.c
pbx_functions: Save module pointer before calling read and write callbacks.
2026-04-22 17:50:23 +00:00
pbx_hangup_handler.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
pbx_ignorepat.c
…
pbx_include.c
aelparse: Accept an included context with timings.
2021-08-06 09:04:28 -05:00
pbx_private.h
extension_state: Add new extension state API.
2026-06-11 18:30:55 +00:00
pbx_sw.c
…
pbx_switch.c
…
pbx_timing.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
pbx_variables.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
pbx.c
extension_state: Add new extension state API.
2026-06-11 18:30:55 +00:00
pickup.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
plc.c
options: Change ast_options from ast_flags to ast_flags64.
2025-07-30 15:59:21 +00:00
poll.c
…
presencestate.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
privacy.c
…
refer.c
ari/pjsip: Make it possible to control transfers through ARI
2025-02-11 22:05:40 +00:00
rtp_engine.c
channel.c: Don't lock the channel in ast_softhangup while setting rtp instance vars
2026-05-06 12:29:34 +00:00
say.c
build: Fix unused-but-set-variable warnings with gcc 16.
2026-02-25 13:25:14 +00:00
sched.c
sched: fix and test a double deref on delete of an executing call back
2022-01-21 10:06:57 -06:00
sdp_srtp.c
…
security_events.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
sem.c
…
serializer_shutdown_group.c
taskpool: Add taskpool API, switch Stasis to using it.
2025-09-16 17:21:23 +00:00
serializer.c
taskpool: Add taskpool API, switch Stasis to using it.
2025-09-16 17:21:23 +00:00
sha1.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
sip_api.c
…
slinfactory.c
…
smoother.c
main: Spelling fixes
2021-11-15 17:33:27 -06:00
sorcery.c
sorcery: Move from threadpool to taskpool.
2025-09-30 13:50:30 +00:00
sounds.c
…
srv.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
stasis_bridges.c
res ari: Add attachable states to Channels and Bridges
2026-06-03 22:54:43 +00:00
stasis_cache_pattern.c
…
stasis_cache.c
stasis: Fix for Doxygen.
2021-11-18 14:46:42 -06:00
stasis_channels.c
res ari: Add attachable states to Channels and Bridges
2026-06-03 22:54:43 +00:00
stasis_endpoints.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
stasis_message_router.c
taskpool: Fix some references to threadpool that should be taskpool.
2025-10-13 15:34:12 +00:00
stasis_message.c
build: Fix a few gcc 13 issues
2023-06-09 18:19:49 +00:00
stasis_state.c
GCC12: Fixes for 18+. state_id_by_topic comparing wrong value
2022-05-09 08:20:46 -05:00
stasis_system.c
docs: Indent <since> tags.
2025-01-29 14:17:54 +00:00
stasis.c
extension_state: Add new extension state API.
2026-06-11 18:30:55 +00:00
strcompat.c
fix: Add macOS (Darwin) compatibility for building Asterisk
2026-02-26 15:51:02 +00:00
stream.c
core_unreal.c: Fix memory leak in ast_unreal_new_channels()
2024-10-17 15:20:36 +00:00
stringfields.c
…
strings.c
ARI Outbound Websockets
2025-06-02 16:35:27 +00:00
stun.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
syslog.c
…
taskpool.c
pjsip: Move from threadpool to taskpool
2025-12-16 17:03:43 +00:00
taskprocessor.c
build: Fix GCC discarded-qualifiers const errors.
2026-02-18 13:43:30 +00:00
tcptls.c
WebSocket Enhancements: Proxies and Keepalives for ARI and Media Outbound Websockets.
2026-06-09 14:22:56 +00:00
tdd.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
term.c
term.c: Add support for extended number format terminfo files.
2021-09-08 19:10:54 -05:00
test.c
Add ability to pass arguments to unit tests from the CLI
2025-01-02 14:52:12 +00:00
threadpool.c
taskprocessors: Improve logging and add new cli options
2025-12-04 16:13:02 +00:00
threadstorage.c
…
time.c
time: add support for time64 libcs
2022-03-24 12:00:58 -05:00
timing.c
…
translate.c
translate.c: implement different sample_types for translation computation.
2026-04-22 19:02:32 +00:00
udptl.c
docs: Fix various typos in main/
2025-02-20 21:46:27 +00:00
ulaw.c
…
uri.c
uri.c: Simplify ast_uri_make_host_with_port()
2023-11-14 20:51:34 +00:00
utf8.c
res_pjsip: Replace invalid UTF-8 sequences in callerid name
2023-03-01 09:49:39 -06:00
utils.c
build: Fix unused-but-set-variable warnings with gcc 16.
2026-02-25 13:25:14 +00:00
uuid.c
main: Fix for Doxygen.
2021-12-02 15:02:09 -06:00
xml.c
fix: Add macOS (Darwin) compatibility for building Asterisk
2026-02-26 15:51:02 +00:00
xmldoc.c
xmldoc.c: Fix memory leaks in handling of provided_by.
2026-03-19 16:41:21 +00:00