On 11/13/18 8:48 AM, Xin Long wrote: > These is no need to hold dst before calling rt6_remove_exception_rt(). > The call to dst_hold_safe() in ip6_link_failure() was for ip6_del_rt(), > which has been removed in Commit 93531c674315 ("net/ipv6: separate > handling of FIB entries from dst based routes"). Otherwise, it will > cause a dst leak. > > This patch is to simply remove the dst_hold_safe() call before calling > rt6_remove_exception_rt() and also do the same in ip6_del_cached_rt(). > It's safe, because the removal of the exception that holds its dst's > refcnt is protected by rt6_exception_lock. > > Fixes: 93531c674315 ("net/ipv6: separate handling of FIB entries from dst > based routes") > Fixes: 23fb93a4d3f1 ("net/ipv6: Cleanup exception and cache route handling") > Reported-by: Li Shuang <shu...@redhat.com> > Signed-off-by: Xin Long <lucien....@gmail.com> > --- > net/ipv6/route.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) >
Ok, I see now. commit ad65a2f05695 add the dst_hold_safe with ip6_del_rt. ip6_del_rt called ip6_rt_put to release the reference taken by the hold_safe. Those paths are gone now. Reviewed-by: David Ahern <dsah...@gmail.com>