[asterisk-bugs] [JIRA] (ASTERISK-21316) Segfault on ast_channel_tech(chan)->send_digit_begin

[Ashley Winters (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-21316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashley Winters updated ASTERISK-21316:
--------------------------------------

    Attachment: gdb-send_digit_begin-segfault.txt

GDB trace showing the NULL dereference.
                
> Segfault on ast_channel_tech(chan)->send_digit_begin
> ----------------------------------------------------
>
>                 Key: ASTERISK-21316
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21316
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/Channels
>    Affects Versions: 11.2.1
>         Environment: CentOS 6.3
>            Reporter: Ashley Winters
>         Attachments: gdb-send_digit_begin-segfault.txt
>
>
> Calling {{ast_channel_tech(chan)}} multiple times in a row while chan is unlocked is a race condition. I experienced a segfault when the tech changed to {{null_tech}} between the null check and the function-pointer dereference.

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