From: Ido Schimmel idosch@mellanox.com
[ Upstream commit 54851aa90cf27041d64b12f65ac72e9f97bd90fd ]
When a route needs to be appended to an existing multipath route, fib6_add_rt2node() first appends it to the siblings list and increments the number of sibling routes on each sibling.
Later, the function notifies the route via call_fib6_entry_notifiers(). In case the notification is vetoed, the route is not unlinked from the siblings list, which can result in a use-after-free.
Fix this by unlinking the route from the siblings list before returning an error.
Audited the rest of the call sites from which the FIB notification chain is called and could not find more problems.
Fixes: 2233000cba40 ("net/ipv6: Move call_fib6_entry_notifiers up for route adds") Signed-off-by: Ido Schimmel idosch@mellanox.com Reported-by: Alexander Petrovskiy alexpe@mellanox.com Reviewed-by: David Ahern dsahern@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv6/ip6_fib.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-)
--- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -1081,8 +1081,24 @@ add: err = call_fib6_entry_notifiers(info->nl_net, FIB_EVENT_ENTRY_ADD, rt, extack); - if (err) + if (err) { + struct fib6_info *sibling, *next_sibling; + + /* If the route has siblings, then it first + * needs to be unlinked from them. + */ + if (!rt->fib6_nsiblings) + return err; + + list_for_each_entry_safe(sibling, next_sibling, + &rt->fib6_siblings, + fib6_siblings) + sibling->fib6_nsiblings--; + rt->fib6_nsiblings = 0; + list_del_init(&rt->fib6_siblings); + rt6_multipath_rebalance(next_sibling); return err; + }
rcu_assign_pointer(rt->fib6_next, iter); atomic_inc(&rt->fib6_ref);