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The following task has a new comment added:
FS#173 - Double Free -- Crash/Coredump and possible security vulnerability
User who did this - Timo Reimann (tr)
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I applied patches to master (commit 8ca6de5) and 3.2 (commit baed41) branches that fix a
problem with the usage of dialog variables.
Details: The flag to indicate that a dialog variable was changed (DLG_FLAG_CHANGED_VARS)
was set with the wrong operator (&= as opposed to |=). This caused all other dialog
flags to reset, including DLG_FLAG_TM introduced to master/3.2 in order to improve dialog
handling of stateless responses. With DLG_FLAG_TM effectively rendered useless, the
reference counter would be decremented too many times, thereby causing a double-free.
Have you been using dialog variables (possibly indirectly by means of CDR generation in
the acc module)? If so, could you try to verify that the bug is fixed in the latest 3.2
branch?
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http://sip-router.org/tracker/index.php?do=details&task_id=173#comment3…
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