diff options
| author | David S. Miller <davem@davemloft.net> | 2018-08-01 21:32:30 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-08-01 21:32:30 -0700 |
| commit | e6aed040eafb4ce1881bbc59a225f6b27d250396 (patch) | |
| tree | 037b7aebd0b832999a44c34b70c4e2768509464c /net | |
| parent | c01f6c9b3207e52fc9973a066a856ddf7a0538d8 (diff) | |
Revert "net/ipv6: fix metrics leak"
This reverts commit df18b50448fab1dff093731dfd0e25e77e1afcd1.
This change causes other problems and use-after-free situations as
found by syzbot.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/ip6_fib.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index 211a2d437b56..d212738e9d10 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -167,22 +167,11 @@ struct fib6_info *fib6_info_alloc(gfp_t gfp_flags) return f6i; } -static void fib6_metrics_release(struct fib6_info *f6i) -{ - struct dst_metrics *m; - - if (!f6i) - return; - - m = f6i->fib6_metrics; - if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt)) - kfree(m); -} - void fib6_info_destroy_rcu(struct rcu_head *head) { struct fib6_info *f6i = container_of(head, struct fib6_info, rcu); struct rt6_exception_bucket *bucket; + struct dst_metrics *m; WARN_ON(f6i->fib6_node); @@ -212,7 +201,9 @@ void fib6_info_destroy_rcu(struct rcu_head *head) if (f6i->fib6_nh.nh_dev) dev_put(f6i->fib6_nh.nh_dev); - fib6_metrics_release(f6i); + m = f6i->fib6_metrics; + if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt)) + kfree(m); kfree(f6i); } @@ -896,7 +887,6 @@ static void fib6_drop_pcpu_from(struct fib6_info *f6i, from = rcu_dereference_protected(pcpu_rt->from, lockdep_is_held(&table->tb6_lock)); - fib6_metrics_release(from); rcu_assign_pointer(pcpu_rt->from, NULL); fib6_info_release(from); } |