From 4be4511af7966b7b0f93d9f129a876458794f2f3 Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Sat, 23 Jul 2016 08:15:04 +0200 Subject: tipc: fix NULL pointer dereference in shutdown() [ Upstream commit d2fbdf76b85bcdfe57b8ef2ba09d20e8ada79abd ] tipc_msg_create() can return a NULL skb and if so, we shouldn't try to call tipc_node_xmit_skb() on it. general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 3 PID: 30298 Comm: trinity-c0 Not tainted 4.7.0-rc7+ #19 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 task: ffff8800baf09980 ti: ffff8800595b8000 task.ti: ffff8800595b8000 RIP: 0010:[] [] tipc_node_xmit_skb+0x6b/0x140 RSP: 0018:ffff8800595bfce8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003023b0e0 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffffffff83d12580 RBP: ffff8800595bfd78 R08: ffffed000b2b7f32 R09: 0000000000000000 R10: fffffbfff0759725 R11: 0000000000000000 R12: 1ffff1000b2b7f9f R13: ffff8800595bfd58 R14: ffffffff83d12580 R15: dffffc0000000000 FS: 00007fcdde242700(0000) GS:ffff88011af80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcddde1db10 CR3: 000000006874b000 CR4: 00000000000006e0 DR0: 00007fcdde248000 DR1: 00007fcddd73d000 DR2: 00007fcdde248000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000090602 Stack: 0000000000000018 0000000000000018 0000000041b58ab3 ffffffff83954208 ffffffff830bb400 ffff8800595bfd30 ffffffff8309d767 0000000000000018 0000000000000018 ffff8800595bfd78 ffffffff8309da1a 00000000810ee611 Call Trace: [] tipc_shutdown+0x553/0x880 [] SyS_shutdown+0x14b/0x170 [] do_syscall_64+0x19c/0x410 [] entry_SYSCALL64_slow_path+0x25/0x25 Code: 90 00 b4 0b 83 c7 00 f1 f1 f1 f1 4c 8d 6d e0 c7 40 04 00 00 00 f4 c7 40 08 f3 f3 f3 f3 48 89 d8 48 c1 e8 03 c7 45 b4 00 00 00 00 <80> 3c 30 00 75 78 48 8d 7b 08 49 8d 75 c0 48 b8 00 00 00 00 00 RIP [] tipc_node_xmit_skb+0x6b/0x140 RSP ---[ end trace 57b0484e351e71f1 ]--- I feel like we should maybe return -ENOMEM or -ENOBUFS, but I'm not sure userspace is equipped to handle that. Anyway, this is better than a GPF and looks somewhat consistent with other tipc_msg_create() callers. Signed-off-by: Vegard Nossum Acked-by: Ying Xue Acked-by: Jon Maloy Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/tipc/socket.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/tipc') diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 9b713e0ce00d..b26b7a127773 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -2111,7 +2111,8 @@ restart: TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, onode, dport, oport, TIPC_CONN_SHUTDOWN); - tipc_node_xmit_skb(net, skb, dnode, tsk->portid); + if (skb) + tipc_node_xmit_skb(net, skb, dnode, tsk->portid); } tsk->connected = 0; sock->state = SS_DISCONNECTING; -- cgit v1.2.3