SUNRPC: add a missing rpc_stat for TCP TLS

Commit 1548036 ("nfs: make the rpc_stat per net namespace") added
functionality to specify rpc_stats function but missed adding it to the
TCP TLS functionality. As the result, mounting with xprtsec=tls lead to
the following kernel oops.

[  128.984192] Unable to handle kernel NULL pointer dereference at
virtual address 000000000000001c
[  128.985058] Mem abort info:
[  128.985372]   ESR = 0x0000000096000004
[  128.985709]   EC = 0x25: DABT (current EL), IL = 32 bits
[  128.986176]   SET = 0, FnV = 0
[  128.986521]   EA = 0, S1PTW = 0
[  128.986804]   FSC = 0x04: level 0 translation fault
[  128.987229] Data abort info:
[  128.987597]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
[  128.988169]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[  128.988811]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[  128.989302] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000106c84000
[  128.990048] [000000000000001c] pgd=0000000000000000, p4d=0000000000000000
[  128.990736] Internal error: Oops: 0000000096000004 [#1] SMP
[  128.991168] Modules linked in: nfs_layout_nfsv41_files
rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace netfs
uinput dm_mod nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 rfkill
ip_set nf_tables nfnetlink qrtr vsock_loopback
vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock
sunrpc vfat fat uvcvideo videobuf2_vmalloc videobuf2_memops uvc
videobuf2_v4l2 videodev videobuf2_common mc vmw_vmci xfs libcrc32c
e1000e crct10dif_ce ghash_ce sha2_ce vmwgfx nvme sha256_arm64
nvme_core sr_mod cdrom sha1_ce drm_ttm_helper ttm drm_kms_helper drm
sg fuse
[  128.996466] CPU: 0 PID: 179 Comm: kworker/u4:26 Kdump: loaded Not
tainted 6.8.0-rc6+ #12
[  128.997226] Hardware name: VMware, Inc. VMware20,1/VBSA, BIOS
VMW201.00V.21805430.BA64.2305221830 05/22/2023
[  128.998084] Workqueue: xprtiod xs_tcp_tls_setup_socket [sunrpc]
[  128.998701] pstate: 81400005 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
[  128.999384] pc : call_start+0x74/0x138 [sunrpc]
[  128.999809] lr : __rpc_execute+0xb8/0x3e0 [sunrpc]
[  129.000244] sp : ffff8000832b3a00
[  129.000508] x29: ffff8000832b3a00 x28: ffff800081ac79c0 x27: ffff800081ac7000
[  129.001111] x26: 0000000004248060 x25: 0000000000000000 x24: ffff800081596008
[  129.001757] x23: ffff80007b087240 x22: ffff00009a509d30 x21: 0000000000000000
[  129.002345] x20: ffff000090075600 x19: ffff00009a509d00 x18: ffffffffffffffff
[  129.002912] x17: 733d4d4554535953 x16: 42555300312d746e x15: ffff8000832b3a88
[  129.003464] x14: ffffffffffffffff x13: ffff8000832b3a7d x12: 0000000000000008
[  129.004021] x11: 0101010101010101 x10: ffff8000150cb560 x9 : ffff80007b087c00
[  129.004577] x8 : ffff00009a509de0 x7 : 0000000000000000 x6 : 00000000be8c4ee3
[  129.005026] x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff000094d56680
[  129.005425] x2 : ffff80007b0637f8 x1 : ffff000090075600 x0 : ffff00009a509d00
[  129.005824] Call trace:
[  129.005967]  call_start+0x74/0x138 [sunrpc]
[  129.006233]  __rpc_execute+0xb8/0x3e0 [sunrpc]
[  129.006506]  rpc_execute+0x160/0x1d8 [sunrpc]
[  129.006778]  rpc_run_task+0x148/0x1f8 [sunrpc]
[  129.007204]  tls_probe+0x80/0xd0 [sunrpc]
[  129.007460]  rpc_ping+0x28/0x80 [sunrpc]
[  129.007715]  rpc_create_xprt+0x134/0x1a0 [sunrpc]
[  129.007999]  rpc_create+0x128/0x2a0 [sunrpc]
[  129.008264]  xs_tcp_tls_setup_socket+0xdc/0x508 [sunrpc]
[  129.008583]  process_one_work+0x174/0x3c8
[  129.008813]  worker_thread+0x2c8/0x3e0
[  129.009033]  kthread+0x100/0x110
[  129.009225]  ret_from_fork+0x10/0x20
[  129.009432] Code: f0ffffc2 911fe042 aa1403e1 aa1303e0 (b9401c83)

Fixes: 1548036 ("nfs: make the rpc_stat per net namespace")
Signed-off-by: Olga Kornievskaia <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>

net/sunrpc/xprtsock.c

@@ -2664,6 +2664,7 @@ static void xs_tcp_tls_setup_socket(struct work_struct *work)
 		.xprtsec	= {
 			.policy		= RPC_XPRTSEC_NONE,
 		},
+		.stats		= upper_clnt->cl_stats,
 	};
 	unsigned int pflags = current->flags;
 	struct rpc_clnt *lower_clnt;