On 12/9/19 6:11 PM, Tuong Lien wrote:
> In the function 'tipc_disc_rcv()', the 'msg_peer_net_hash()' is called
> to read the header data field but after the message skb has been freed,
> that might result in a garbage value...
>
> This commit fixes it by defining a new local variable to store the data
> first, just like the other header fields' handling.
>
> Fixes: f73b12812a3d ("tipc: improve throughput between nodes in netns")
> Signed-off-by: Tuong Lien <[email protected]>
Acked-by: Ying Xue <[email protected]>
> ---
> net/tipc/discover.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/net/tipc/discover.c b/net/tipc/discover.c
> index b043e8c6397a..bfe43da127c0 100644
> --- a/net/tipc/discover.c
> +++ b/net/tipc/discover.c
> @@ -194,6 +194,7 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
> {
> struct tipc_net *tn = tipc_net(net);
> struct tipc_msg *hdr = buf_msg(skb);
> + u32 pnet_hash = msg_peer_net_hash(hdr);
> u16 caps = msg_node_capabilities(hdr);
> bool legacy = tn->legacy_addr_format;
> u32 sugg = msg_sugg_node_addr(hdr);
> @@ -242,9 +243,8 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
> return;
> if (!tipc_in_scope(legacy, b->domain, src))
> return;
> - tipc_node_check_dest(net, src, peer_id, b, caps, signature,
> - msg_peer_net_hash(hdr), &maddr, &respond,
> - &dupl_addr);
> + tipc_node_check_dest(net, src, peer_id, b, caps, signature, pnet_hash,
> + &maddr, &respond, &dupl_addr);
> if (dupl_addr)
> disc_dupl_alert(b, src, &maddr);
> if (!respond)
>
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