[asterisk-bugs] [JIRA] Created: (ASTERISK-20472) dialplan fails to run the invalid "i" extension due to an uninitialized variable dat_exten in main/pbx.c

[Rusty Newton (JIRA)]

dialplan fails to run the invalid "i" extension due to an uninitialized variable dat_exten in main/pbx.c
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                 Key: ASTERISK-20472
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20472
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Core/PBX
    Affects Versions: 1.8.16.0, 10.8.0, 11.0.0-beta2
         Environment: Fedora Core 5 i686 i386, gcc 4.1.1
            Reporter: Richard Miller
            Severity: Critical


The dialplan fails to run the invalid "i" extension due to an uninitialized variable dat_exten in main/pbx.c

In the following code I had to use the word OR instead of the pipe characters because JIRA was causing the text to display in an unexpected fashion.

Because dst_exten contains random data, it fails at the block of code that reads:

{code:title=in version 1.8.16.0}
if (invalid
 OR (ast_strlen_zero(dst_exten) &&
  !ast_exists_extension(c, c->context, c->exten, 1,
   S_COR(c->caller.id.number.valid, c->caller.id.number.str, NULL)))) {
{code}

{code:title=in version 11.0.0-beta2}
if (invalid
 OR (ast_strlen_zero(dst_exten) &&
  !ast_exists_extension(c, ast_channel_context(c), ast_channel_exten(c), 1,
  S_COR(ast_channel_caller(c)->id.number.valid, ast_channel_caller(c)->id.number.str, NULL)))) {
{code}


I have another newer system under CentOS 6.2 x86_64 that does not exhibit the problem, but nevertheless, there is a flaw in the code that goes back many generations.

My company's production system had been running Asterisk 1.6.2.11-rc2 for several years under Fedora Core 5.  I wanted to use some of the newer features in Asterisk 1.8, so I installed the latest version.  However, when I tried placing a call, it would not go through.

The console showed:
auto fallthrough, channel 'SIP/131-00000005' status is 'UNKNOWN'

My dialplan uses the i extension in several places and this was happening right where it should have dispatched extension i.  Once I applied the one line patch I am submitting, the problem went away.

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