Re: [tor-bugs] #16823 [Tor]: potential double-free in command_process_create_cell()

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#16823: potential double-free in command_process_create_cell()
-------------------------+-------------------------------------------------
     Reporter:  isis     |      Owner:
         Type:  defect   |     Status:  needs_review
     Priority:  blocker  |  Milestone:
    Component:  Tor      |    Version:  Tor: 0.2.4.10-alpha
   Resolution:           |   Keywords:  tor-relay, tor-guard, security,
Actual Points:           |  024-backport, 025-backport, 026-backport
       Points:           |  Parent ID:
-------------------------+-------------------------------------------------

Comment (by isis):

 Replying to [comment:4 nickm]:
 > PREDICT_LIKELY()  expands to:
 > {{{
 > /** Macro: Evaluates to <b>exp</b> and hints the compiler that the value
 >  * of <b>exp</b> will probably be true.
 >  *
 >  * In other words, "if (PREDICT_LIKELY(foo))" is the same as "if (foo)",
 >  * except that it tells the compiler that the branch will be taken most
 of the
 >  * time.  This can generate slightly better code with some CPUs.
 >  */
 > #define PREDICT_LIKELY(exp) __builtin_expect(!!(exp), 1)
 > }}}

 Yeah, you're right, it should be okay. Phew! Sorry for tagging it security
 in a panic.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16823#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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