diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index 140d4cb4b1d1c4503ccf77ad1b208fb640dc7a05..9159118410973113231e3eab7f6bc4fa066dfc51 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -4246,6 +4246,7 @@ static void dahdi_r2_on_call_disconnect(openr2_chan_t *r2chan, openr2_call_disco
snprintf(cause_str, sizeof(cause_str), "R2 DISCONNECT (%s)", openr2_proto_get_disconnect_string(cause));
datalen += strlen(cause_str);
cause_code = ast_alloca(datalen);
+ memset(cause_code, 0, datalen);
cause_code->ast_cause = dahdi_r2_cause_to_ast_cause(cause);
ast_copy_string(cause_code->chan_name, ast_channel_name(p->owner), AST_CHANNEL_NAME);
ast_copy_string(cause_code->code, cause_str, datalen + 1 - sizeof(*cause_code));
diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 77b1471bc52f89b4dd29de1f3bba1a38caefdb23..21bd1fc2e761a30c02f4d72202796a0ad0d40097 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -10243,6 +10243,7 @@ static int socket_process_helper(struct iax2_thread *thread)
data_size += strlen(subclass);
cause_code = ast_alloca(data_size);
+ memset(cause_code, 0, data_size);
ast_copy_string(cause_code->chan_name, ast_channel_name(iaxs[fr->callno]->owner), AST_CHANNEL_NAME);
cause_code->ast_cause = ies.causecode;
diff --git a/channels/chan_motif.c b/channels/chan_motif.c
index 86b31e0fb75c160aae0870f9f1facd95625bab28..751e33a23d05051882f2f95fedc92727d5798faa 100644
--- a/channels/chan_motif.c
+++ b/channels/chan_motif.c
@@ -2373,7 +2373,8 @@ static void jingle_action_session_terminate(struct jingle_endpoint *endpoint, st
/* Size of the string making up the cause code is "Motif " + text */
data_size += 6 + strlen(iks_name(text));
- cause_code = ast_malloc(data_size);
+ cause_code = ast_alloca(data_size);
+ memset(cause_code, 0, data_size);
/* Get the appropriate cause code mapping for this reason */
for (i = 0; i < ARRAY_LEN(jingle_reason_mappings); i++) {
@@ -2387,7 +2388,8 @@ static void jingle_action_session_terminate(struct jingle_endpoint *endpoint, st
snprintf(cause_code->code, data_size - sizeof(*cause_code) + 1, "Motif %s", iks_name(text));
} else {
/* No technology specific information is available */
- cause_code = ast_malloc(data_size);
+ cause_code = ast_alloca(data_size);
+ memset(cause_code, 0, data_size);
}
ast_copy_string(cause_code->chan_name, ast_channel_name(chan), AST_CHANNEL_NAME);
@@ -2395,8 +2397,6 @@ static void jingle_action_session_terminate(struct jingle_endpoint *endpoint, st
ast_queue_control_data(chan, AST_CONTROL_PVT_CAUSE_CODE, cause_code, data_size);
ast_channel_hangupcause_hash_set(chan, cause_code, data_size);
- ast_free(cause_code);
-
ast_debug(3, "Hanging up channel '%s' due to session terminate message with cause '%d'\n", ast_channel_name(chan), cause);
ast_queue_hangup_with_cause(chan, cause);
session->gone = 1;
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 196322dcb926d60cfafd97815224e136cb6c3978..ae9c0a46d2900e72b14f132ce0ed4694f48995bf 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -28069,6 +28069,7 @@ static int handle_incoming(struct sip_pvt *p, struct sip_request *req, struct as
/* size of the string making up the cause code is "SIP " + cause length */
data_size += 4 + strlen(REQ_OFFSET_TO_STR(req, rlpart2));
cause_code = ast_alloca(data_size);
+ memset(cause_code, 0, data_size);
ast_copy_string(cause_code->chan_name, ast_channel_name(p->owner), AST_CHANNEL_NAME);
diff --git a/channels/sig_analog.c b/channels/sig_analog.c
index e710c2b24a117b9e4f962e1bfb6cfe8ad51dba5e..85fda9d61a65452dbf625e079fcad29c12181016 100644
--- a/channels/sig_analog.c
+++ b/channels/sig_analog.c
@@ -2734,6 +2734,7 @@ static struct ast_frame *__analog_handle_event(struct analog_pvt *p, struct ast_
subclass = analog_event2str(res);
data_size += strlen(subclass);
cause_code = ast_alloca(data_size);
+ memset(cause_code, 0, data_size);
cause_code->ast_cause = AST_CAUSE_NORMAL_CLEARING;
ast_copy_string(cause_code->chan_name, ast_channel_name(ast), AST_CHANNEL_NAME);
snprintf(cause_code->code, data_size - sizeof(*cause_code) + 1, "ANALOG %s", subclass);
diff --git a/channels/sig_pri.c b/channels/sig_pri.c
index e5fe18de63d989774274a686dcacac0196c5fc77..01ceffce9a4b1342a2c92d0aeaa3420485b92d23 100644
--- a/channels/sig_pri.c
+++ b/channels/sig_pri.c
@@ -1296,6 +1296,7 @@ static void pri_queue_pvt_cause_data(struct sig_pri_span *pri, int chanpos, cons
if (chan) {
int datalen = sizeof(*cause_code) + strlen(cause);
cause_code = ast_alloca(datalen);
+ memset(cause_code, 0, datalen);
cause_code->ast_cause = ast_cause;
ast_copy_string(cause_code->chan_name, ast_channel_name(chan), AST_CHANNEL_NAME);
ast_copy_string(cause_code->code, cause, datalen + 1 - sizeof(*cause_code));
diff --git a/channels/sig_ss7.c b/channels/sig_ss7.c
index d5a92c332c81f4561e4705c3aa2ee7045f925d29..baf152d4e902e38c36463ca9c185c7ee98e98fab 100644
--- a/channels/sig_ss7.c
+++ b/channels/sig_ss7.c
@@ -411,6 +411,7 @@ static void ss7_queue_pvt_cause_data(struct ast_channel *owner, const char *caus
int datalen = sizeof(*cause_code) + strlen(cause);
cause_code = ast_alloca(datalen);
+ memset(cause_code, 0, datalen);
cause_code->ast_cause = ast_cause;
ast_copy_string(cause_code->chan_name, ast_channel_name(owner), AST_CHANNEL_NAME);
ast_copy_string(cause_code->code, cause, datalen + 1 - sizeof(*cause_code));