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chan_pjsip: Don't assume a session will have a channel.

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When querying for PJSIP specific information using the dialplan
function CHANNEL() it is possible that the underlying session
will no longer have a channel associated with it. This is
most likely to occur when the RTCP HEP module attempts to get
the channel name. If this happens then a crash will occur.

This change just adds a check that the channel exists on the
session before querying it.

ASTERISK-26857

Change-Id: I113479cffff6ae64cf8ed089e9e1565223426f01
This commit is contained in:
Joshua Colp
2017-03-12 14:21:16 +00:00
parent 018e01543d
commit 12460b05c1
1 changed files with 16 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
channels/pjsip/dialplan_functions.c
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@@ -735,17 +735,27 @@ static int read_pjsip(void *data)
struct pjsip_func_args *func_args = data;
if (!strcmp(func_args->param, "rtp")) {
if (!func_args->session->channel) {
func_args->ret = -1;
return 0;
}
func_args->ret = channel_read_rtp(func_args->session->channel, func_args->type,
func_args->field, func_args->buf,
func_args->len);
} else if (!strcmp(func_args->param, "rtcp")) {
if (!func_args->session->channel) {
func_args->ret = -1;
return 0;
}
func_args->ret = channel_read_rtcp(func_args->session->channel, func_args->type,
func_args->field, func_args->buf,
func_args->len);
} else if (!strcmp(func_args->param, "endpoint")) {
if (!func_args->session->endpoint) {
ast_log(AST_LOG_WARNING, "Channel %s has no endpoint!\n", ast_channel_name(func_args->session->channel));
return -1;
ast_log(AST_LOG_WARNING, "Channel %s has no endpoint!\n", func_args->session->channel ?
ast_channel_name(func_args->session->channel) : "<unknown>");
func_args->ret = -1;
return 0;
}
snprintf(func_args->buf, func_args->len, "%s", ast_sorcery_object_get_id(func_args->session->endpoint));
} else if (!strcmp(func_args->param, "contact")) {
@@ -759,6 +769,10 @@ static int read_pjsip(void *data)
}
snprintf(func_args->buf, func_args->len, "%s", ast_sorcery_object_get_id(func_args->session->aor));
} else if (!strcmp(func_args->param, "pjsip")) {
if (!func_args->session->channel) {
func_args->ret = -1;
return 0;
}
func_args->ret = channel_read_pjsip(func_args->session->channel, func_args->type,
func_args->field, func_args->buf,
func_args->len);