diff options
Diffstat (limited to 'net/ipv4/ipmr.c')
| -rw-r--r-- | net/ipv4/ipmr.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index 8fe7a688cf41..8a94f9a459cd 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -582,6 +582,7 @@ static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, { struct net_device *reg_dev = NULL; struct iphdr *encap; + int vif_num; encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); /* Check that: @@ -594,11 +595,10 @@ static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, ntohs(encap->tot_len) + pimlen > skb->len) return 1; - read_lock(&mrt_lock); - if (mrt->mroute_reg_vif_num >= 0) - reg_dev = vif_dev_read(&mrt->vif_table[mrt->mroute_reg_vif_num]); - read_unlock(&mrt_lock); - + /* Pairs with WRITE_ONCE() in vif_add()/vid_delete() */ + vif_num = READ_ONCE(mrt->mroute_reg_vif_num); + if (vif_num >= 0) + reg_dev = vif_dev_read(&mrt->vif_table[vif_num]); if (!reg_dev) return 1; |