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authorEric Dumazet <edumazet@google.com>2018-04-16 18:29:43 +0300
committerDavid S. Miller <davem@davemloft.net>2018-04-17 01:08:18 +0300
commitc6404122cb18f1fbd2a6dc85ab687f6fa2e454cf (patch)
tree446adab675af1e507ab048a2efe35edd427fdd34 /net/tipc/net.c
parentec518f21cb1a1b1f8a516499ea05c60299e04963 (diff)
downloadlinux-c6404122cb18f1fbd2a6dc85ab687f6fa2e454cf.tar.xz
tipc: fix possible crash in __tipc_nl_net_set()
syzbot reported a crash in __tipc_nl_net_set() caused by NULL dereference. We need to check that both TIPC_NLA_NET_NODEID and TIPC_NLA_NET_NODEID_W1 are present. We also need to make sure userland provided u64 attributes. Fixes: d50ccc2d3909 ("tipc: add 128-bit node identifier") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Jon Maloy <jon.maloy@ericsson.com> Cc: Ying Xue <ying.xue@windriver.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/net.c')
-rw-r--r--net/tipc/net.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/tipc/net.c b/net/tipc/net.c
index 856f9e97ea29..4fbaa0464405 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -252,6 +252,8 @@ int __tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
u64 *w0 = (u64 *)&node_id[0];
u64 *w1 = (u64 *)&node_id[8];
+ if (!attrs[TIPC_NLA_NET_NODEID_W1])
+ return -EINVAL;
*w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
*w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
tipc_net_init(net, node_id, 0);