From: Chen Zhongjin chenzhongjin@huawei.com
[ Upstream commit 40781bfb836eda57d19c0baa37c7e72590e05fdc ]
When IPv6 module initializing in xfrm6_init(), register_pernet_subsys() is possible to fail but its return value is ignored.
If IPv6 initialization fails later and xfrm6_fini() is called, removing uninitialized list in xfrm6_net_ops will cause null-ptr-deref:
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 330 Comm: insmod RIP: 0010:unregister_pernet_operations+0xc9/0x450 Call Trace: <TASK> unregister_pernet_subsys+0x31/0x3e xfrm6_fini+0x16/0x30 [ipv6] ip6_route_init+0xcd/0x128 [ipv6] inet6_init+0x29c/0x602 [ipv6] ...
Fix it by catching the error return value of register_pernet_subsys().
Fixes: 8d068875caca ("xfrm: make gc_thresh configurable in all namespaces") Signed-off-by: Chen Zhongjin chenzhongjin@huawei.com Reviewed-by: Leon Romanovsky leonro@nvidia.com Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv6/xfrm6_policy.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c index af7a4b8b1e9c..247296e3294b 100644 --- a/net/ipv6/xfrm6_policy.c +++ b/net/ipv6/xfrm6_policy.c @@ -289,9 +289,13 @@ int __init xfrm6_init(void) if (ret) goto out_state;
- register_pernet_subsys(&xfrm6_net_ops); + ret = register_pernet_subsys(&xfrm6_net_ops); + if (ret) + goto out_protocol; out: return ret; +out_protocol: + xfrm6_protocol_fini(); out_state: xfrm6_state_fini(); out_policy: