diff options
Diffstat (limited to 'net/ipv4/ipmr.c')
| -rw-r--r-- | net/ipv4/ipmr.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index f975399f3522..df97f0ac1a1c 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -945,6 +945,7 @@ static int ipmr_cache_report(struct mr_table *mrt, struct igmpmsg *msg; struct sock *mroute_sk; int ret; + unsigned long tail_offset; #ifdef CONFIG_IP_PIMSM if (assert == IGMPMSG_WHOLEPKT) @@ -980,7 +981,12 @@ static int ipmr_cache_report(struct mr_table *mrt, /* Copy the IP header */ - skb->network_header = skb->tail; + tail_offset = skb_tail_offset(skb); + if (tail_offset > 0xffff) { + kfree_skb(skb); + return -EINVAL; + } + skb_set_network_header(skb, tail_offset); skb_put(skb, ihl); skb_copy_to_linear_data(skb, pkt->data, ihl); ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |