From cb8092d70a6f5f01ec1490fce4d35efed3ed996c Mon Sep 17 00:00:00 2001 From: Xin Long Date: Fri, 24 Jun 2022 12:24:31 -0400 Subject: tipc: move bc link creation back to tipc_node_create Shuang Li reported a NULL pointer dereference crash: [] BUG: kernel NULL pointer dereference, address: 0000000000000068 [] RIP: 0010:tipc_link_is_up+0x5/0x10 [tipc] [] Call Trace: [] [] tipc_bcast_rcv+0xa2/0x190 [tipc] [] tipc_node_bc_rcv+0x8b/0x200 [tipc] [] tipc_rcv+0x3af/0x5b0 [tipc] [] tipc_udp_recv+0xc7/0x1e0 [tipc] It was caused by the 'l' passed into tipc_bcast_rcv() is NULL. When it creates a node in tipc_node_check_dest(), after inserting the new node into hashtable in tipc_node_create(), it creates the bc link. However, there is a gap between this insert and bc link creation, a bc packet may come in and get the node from the hashtable then try to dereference its bc link, which is NULL. This patch is to fix it by moving the bc link creation before inserting into the hashtable. Note that for a preliminary node becoming "real", the bc link creation should also be called before it's rehashed, as we don't create it for preliminary nodes. Fixes: 4cbf8ac2fe5a ("tipc: enable creating a "preliminary" node") Reported-by: Shuang Li Signed-off-by: Xin Long Acked-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/node.c | 41 ++++++++++++++++++++++------------------- 1 file changed, 22 insertions(+), 19 deletions(-) diff --git a/net/tipc/node.c b/net/tipc/node.c index 6ef95ce565bd..b48d97cbbe29 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -472,8 +472,8 @@ struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id, bool preliminary) { struct tipc_net *tn = net_generic(net, tipc_net_id); + struct tipc_link *l, *snd_l = tipc_bc_sndlink(net); struct tipc_node *n, *temp_node; - struct tipc_link *l; unsigned long intv; int bearer_id; int i; @@ -488,6 +488,16 @@ struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id, goto exit; /* A preliminary node becomes "real" now, refresh its data */ tipc_node_write_lock(n); + if (!tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX, + tipc_link_min_win(snd_l), tipc_link_max_win(snd_l), + n->capabilities, &n->bc_entry.inputq1, + &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) { + pr_warn("Broadcast rcv link refresh failed, no memory\n"); + tipc_node_write_unlock_fast(n); + tipc_node_put(n); + n = NULL; + goto exit; + } n->preliminary = false; n->addr = addr; hlist_del_rcu(&n->hash); @@ -567,7 +577,16 @@ update: n->signature = INVALID_NODE_SIG; n->active_links[0] = INVALID_BEARER_ID; n->active_links[1] = INVALID_BEARER_ID; - n->bc_entry.link = NULL; + if (!preliminary && + !tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX, + tipc_link_min_win(snd_l), tipc_link_max_win(snd_l), + n->capabilities, &n->bc_entry.inputq1, + &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) { + pr_warn("Broadcast rcv link creation failed, no memory\n"); + kfree(n); + n = NULL; + goto exit; + } tipc_node_get(n); timer_setup(&n->timer, tipc_node_timeout, 0); /* Start a slow timer anyway, crypto needs it */ @@ -1155,7 +1174,7 @@ void tipc_node_check_dest(struct net *net, u32 addr, bool *respond, bool *dupl_addr) { struct tipc_node *n; - struct tipc_link *l, *snd_l; + struct tipc_link *l; struct tipc_link_entry *le; bool addr_match = false; bool sign_match = false; @@ -1175,22 +1194,6 @@ void tipc_node_check_dest(struct net *net, u32 addr, return; tipc_node_write_lock(n); - if (unlikely(!n->bc_entry.link)) { - snd_l = tipc_bc_sndlink(net); - if (!tipc_link_bc_create(net, tipc_own_addr(net), - addr, peer_id, U16_MAX, - tipc_link_min_win(snd_l), - tipc_link_max_win(snd_l), - n->capabilities, - &n->bc_entry.inputq1, - &n->bc_entry.namedq, snd_l, - &n->bc_entry.link)) { - pr_warn("Broadcast rcv link creation failed, no mem\n"); - tipc_node_write_unlock_fast(n); - tipc_node_put(n); - return; - } - } le = &n->links[b->identity]; -- cgit v1.2.3