Patch "nfs: Handle error of rpc_proc_register() in nfs_net_init()." has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    nfs: Handle error of rpc_proc_register() in nfs_net_init().

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfs-handle-error-of-rpc_proc_register-in-nfs_net_ini.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 54966d9f2e306b3e453786f348e05c4a70ad0a1f
Author: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Date:   Thu Apr 4 15:12:00 2024 -0700

    nfs: Handle error of rpc_proc_register() in nfs_net_init().
    
    [ Upstream commit 24457f1be29f1e7042e50a7749f5c2dde8c433c8 ]
    
    syzkaller reported a warning [0] triggered while destroying immature
    netns.
    
    rpc_proc_register() was called in init_nfs_fs(), but its error
    has been ignored since at least the initial commit 1da177e4c3f4
    ("Linux-2.6.12-rc2").
    
    Recently, commit d47151b79e32 ("nfs: expose /proc/net/sunrpc/nfs
    in net namespaces") converted the procfs to per-netns and made
    the problem more visible.
    
    Even when rpc_proc_register() fails, nfs_net_init() could succeed,
    and thus nfs_net_exit() will be called while destroying the netns.
    
    Then, remove_proc_entry() will be called for non-existing proc
    directory and trigger the warning below.
    
    Let's handle the error of rpc_proc_register() properly in nfs_net_init().
    
    [0]:
    name 'nfs'
    WARNING: CPU: 1 PID: 1710 at fs/proc/generic.c:711 remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711
    Modules linked in:
    CPU: 1 PID: 1710 Comm: syz-executor.2 Not tainted 6.8.0-12822-gcd51db110a7e #12
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
    RIP: 0010:remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711
    Code: 41 5d 41 5e c3 e8 85 09 b5 ff 48 c7 c7 88 58 64 86 e8 09 0e 71 02 e8 74 09 b5 ff 4c 89 e6 48 c7 c7 de 1b 80 84 e8 c5 ad 97 ff <0f> 0b eb b1 e8 5c 09 b5 ff 48 c7 c7 88 58 64 86 e8 e0 0d 71 02 eb
    RSP: 0018:ffffc9000c6d7ce0 EFLAGS: 00010286
    RAX: 0000000000000000 RBX: ffff8880422b8b00 RCX: ffffffff8110503c
    RDX: ffff888030652f00 RSI: ffffffff81105045 RDI: 0000000000000001
    RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
    R10: 0000000000000001 R11: ffffffff81bb62cb R12: ffffffff84807ffc
    R13: ffff88804ad6fcc0 R14: ffffffff84807ffc R15: ffffffff85741ff8
    FS:  00007f30cfba8640(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007ff51afe8000 CR3: 000000005a60a005 CR4: 0000000000770ef0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    PKRU: 55555554
    Call Trace:
     <TASK>
     rpc_proc_unregister+0x64/0x70 net/sunrpc/stats.c:310
     nfs_net_exit+0x1c/0x30 fs/nfs/inode.c:2438
     ops_exit_list+0x62/0xb0 net/core/net_namespace.c:170
     setup_net+0x46c/0x660 net/core/net_namespace.c:372
     copy_net_ns+0x244/0x590 net/core/net_namespace.c:505
     create_new_namespaces+0x2ed/0x770 kernel/nsproxy.c:110
     unshare_nsproxy_namespaces+0xae/0x160 kernel/nsproxy.c:228
     ksys_unshare+0x342/0x760 kernel/fork.c:3322
     __do_sys_unshare kernel/fork.c:3393 [inline]
     __se_sys_unshare kernel/fork.c:3391 [inline]
     __x64_sys_unshare+0x1f/0x30 kernel/fork.c:3391
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0x4f/0x110 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x46/0x4e
    RIP: 0033:0x7f30d0febe5d
    Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48
    RSP: 002b:00007f30cfba7cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
    RAX: ffffffffffffffda RBX: 00000000004bbf80 RCX: 00007f30d0febe5d
    RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c020600
    RBP: 00000000004bbf80 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
    R13: 000000000000000b R14: 00007f30d104c530 R15: 0000000000000000
     </TASK>
    
    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Reported-by: syzkaller <syzkaller@xxxxxxxxxxxxxxxx>
    Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
    Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 91b4d811958a4..6fe4b47c39287 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -2429,7 +2429,12 @@ static int nfs_net_init(struct net *net)
 	struct nfs_net *nn = net_generic(net, nfs_net_id);
 
 	nfs_clients_init(net);
-	rpc_proc_register(net, &nn->rpcstats);
+
+	if (!rpc_proc_register(net, &nn->rpcstats)) {
+		nfs_clients_exit(net);
+		return -ENOMEM;
+	}
+
 	return nfs_fs_proc_net_init(net);
 }
 




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