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    Subject[7/9] Timercode race in AX.25
    -stable review patch.  If anyone has any objections, please let us know.


    From: Ralf Baechle DL5RB <>

    When destroying a socket ax25_destroy_socket tries to stop the protocol's
    T1 timer before freeing the memory. If things are just right using the
    non-sync variant of del_timer means the timer will continue to run even
    after the del_timer because it's adding itself again which is likely to
    result in a crash when the timer is executed again a few seconds later.

    del_timer_sync can be expensive, so I don't want this one to go into 2.6
    mainline where I'll try to cook something that is less intrusive than
    regular calls to del_timer_sync.

    Signed-off-by: Ralf Baechle DL5RB <>
    Signed-off-by: Chris Wright <>
    Signed-off-by: Greg Kroah-Hartman <>

    --- bk-afu.orig/net/ax25/ax25_timer.c 2005-03-08 13:54:06.000000000 +0000
    +++ bk-afu/net/ax25/ax25_timer.c 2005-03-08 16:43:34.790532976 +0000
    @@ -106,7 +106,7 @@

    void ax25_stop_t1timer(ax25_cb *ax25)
    - del_timer(&ax25->t1timer);
    + del_timer_sync(&ax25->t1timer);

    void ax25_stop_t2timer(ax25_cb *ax25)
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      Last update: 2005-03-22 14:11    [W:0.020 / U:1.092 seconds]
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