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bgpd: Fix crash when disabling dampening (BZ#687)

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Vladimir Podobaev reported that the following commands crashed the
daemon.

router bgp 123
 bgp dampening
 no bgp dampening 1 2 3 4
 no bgp dampening

    The problem was that bgp_damp_info_clean() tried to dereference the
already freed reuse_list array in the second call to "no bgp dampening".

    Fixed by checking in bgp_damp_disable() that the dampening it's
enabled before doing the cleanup.

Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
This commit is contained in:
Jorge Boncompte [DTI2] 2012-04-13 13:46:09 +02:00 committed by David Lamparter
parent 7939e016b3
commit fa4094ac49
1 changed files with 4 additions and 0 deletions
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4
bgpd/bgp_damp.c
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@ -498,6 +498,10 @@ bgp_damp_info_clean (void)
int
bgp_damp_disable (struct bgp *bgp, afi_t afi, safi_t safi)
{
/* If it wasn't enabled, there's nothing to do. */
if (! CHECK_FLAG (bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING))
return 0;
/* Cancel reuse thread. */
if (damp->t_reuse )
thread_cancel (damp->t_reuse);