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Michael Brown 17f09dfe03 [retry] Fix potential use-after-free in timer_expired()
timer->refcnt is allowed to be NULL, in which case the timer's
expired() method may end up freeing the timer object.

Discovered using valgrind.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
2011-07-16 01:49:47 +01:00
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