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[retry] Fix potential use-after-free in timer_expired()

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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>
This commit is contained in:
Michael Brown 2011-07-16 01:46:12 +01:00
parent 5b41381f33
commit 17f09dfe03
1 changed files with 3 additions and 1 deletions
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4
src/net/retry.c
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@ -148,6 +148,7 @@ void stop_timer ( struct retry_timer *timer ) {
* @v timer Retry timer
*/
static void timer_expired ( struct retry_timer *timer ) {
struct refcnt *refcnt = timer->refcnt;
int fail;
/* Stop timer without performing RTT calculations */
@ -169,8 +170,9 @@ static void timer_expired ( struct retry_timer *timer ) {
/* Call expiry callback */
timer->expired ( timer, fail );
/* If refcnt is NULL, then timer may already have been freed */
ref_put ( timer->refcnt );
ref_put ( refcnt );
}
/**