From 445c0b69c72903528fdf0b34015b5b9142062c4b Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 6 May 2024 12:30:32 +0000 Subject: [PATCH] mptcp: fix possible NULL dereferences subflow_add_reset_reason(skb, ...) can fail. We can not assume mptcp_get_ext(skb) always return a non NULL pointer. syzbot reported: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 PID: 5098 Comm: syz-executor132 Not tainted 6.9.0-rc6-syzkaller-01478-gcdc74c9d06e7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:subflow_v6_route_req+0x2c7/0x490 net/mptcp/subflow.c:388 Code: 8d 7b 07 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 c0 01 00 00 0f b6 43 07 48 8d 1c c3 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 84 01 00 00 0f b6 5b 01 83 e3 0f 48 89 RSP: 0018:ffffc9000362eb68 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff888022039e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88807d961140 R08: ffffffff8b6cb76b R09: 1ffff1100fb2c230 R10: dffffc0000000000 R11: ffffed100fb2c231 R12: dffffc0000000000 R13: ffff888022bfe273 R14: ffff88802cf9cc80 R15: ffff88802ad5a700 FS: 0000555587ad2380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f420c3f9720 CR3: 0000000022bfc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tcp_conn_request+0xf07/0x32c0 net/ipv4/tcp_input.c:7180 tcp_rcv_state_process+0x183c/0x4500 net/ipv4/tcp_input.c:6663 tcp_v6_do_rcv+0x8b2/0x1310 net/ipv6/tcp_ipv6.c:1673 tcp_v6_rcv+0x22b4/0x30b0 net/ipv6/tcp_ipv6.c:1910 ip6_protocol_deliver_rcu+0xc76/0x1570 net/ipv6/ip6_input.c:438 ip6_input_finish+0x186/0x2d0 net/ipv6/ip6_input.c:483 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5625 [inline] __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5739 netif_receive_skb_internal net/core/dev.c:5825 [inline] netif_receive_skb+0x1e8/0x890 net/core/dev.c:5885 tun_rx_batched+0x1b7/0x8f0 drivers/net/tun.c:1549 tun_get_user+0x2f35/0x4560 drivers/net/tun.c:2002 tun_chr_write_iter+0x113/0x1f0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa84/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Fixes: 3e140491dd80 ("mptcp: support rstreason for passive reset") Reported-by: syzbot Signed-off-by: Eric Dumazet Acked-by: Paolo Abeni Reviewed-by: Matthieu Baerts (NGI0) Reviewed-by: Jason Xing Link: https://lore.kernel.org/r/20240506123032.3351895-1-edumazet@google.com Signed-off-by: Jakub Kicinski --- net/mptcp/subflow.c | 32 +++++++++++++++++--------------- 1 file changed, 17 insertions(+), 15 deletions(-) diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 0ac8d4850751..c1d13e555d10 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -287,6 +287,16 @@ int mptcp_subflow_init_cookie_req(struct request_sock *req, } EXPORT_SYMBOL_GPL(mptcp_subflow_init_cookie_req); +static enum sk_rst_reason mptcp_get_rst_reason(const struct sk_buff *skb) +{ + const struct mptcp_ext *mpext = mptcp_get_ext(skb); + + if (!mpext) + return SK_RST_REASON_NOT_SPECIFIED; + + return sk_rst_convert_mptcp_reason(mpext->reset_reason); +} + static struct dst_entry *subflow_v4_route_req(const struct sock *sk, struct sk_buff *skb, struct flowi *fl, @@ -308,13 +318,9 @@ static struct dst_entry *subflow_v4_route_req(const struct sock *sk, return dst; dst_release(dst); - if (!req->syncookie) { - struct mptcp_ext *mpext = mptcp_get_ext(skb); - enum sk_rst_reason reason; - - reason = sk_rst_convert_mptcp_reason(mpext->reset_reason); - tcp_request_sock_ops.send_reset(sk, skb, reason); - } + if (!req->syncookie) + tcp_request_sock_ops.send_reset(sk, skb, + mptcp_get_rst_reason(skb)); return NULL; } @@ -381,13 +387,9 @@ static struct dst_entry *subflow_v6_route_req(const struct sock *sk, return dst; dst_release(dst); - if (!req->syncookie) { - struct mptcp_ext *mpext = mptcp_get_ext(skb); - enum sk_rst_reason reason; - - reason = sk_rst_convert_mptcp_reason(mpext->reset_reason); - tcp6_request_sock_ops.send_reset(sk, skb, reason); - } + if (!req->syncookie) + tcp6_request_sock_ops.send_reset(sk, skb, + mptcp_get_rst_reason(skb)); return NULL; } #endif @@ -923,7 +925,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk, tcp_rsk(req)->drop_req = true; inet_csk_prepare_for_destroy_sock(child); tcp_done(child); - reason = sk_rst_convert_mptcp_reason(mptcp_get_ext(skb)->reset_reason); + reason = mptcp_get_rst_reason(skb); req->rsk_ops->send_reset(sk, skb, reason); /* The last child reference will be released by the caller */