nfs: handle failure of nfs_get_lock_context in unlock path

JIRA: https://issues.redhat.com/browse/RHEL-108616

commit c457dc1
Author: Li Lingfeng <lilingfeng3@huawei.com>
Date:   Thu Apr 17 15:25:08 2025 +0800

    nfs: handle failure of nfs_get_lock_context in unlock path

    When memory is insufficient, the allocation of nfs_lock_context in
    nfs_get_lock_context() fails and returns -ENOMEM. If we mistakenly treat
    an nfs4_unlockdata structure (whose l_ctx member has been set to -ENOMEM)
    as valid and proceed to execute rpc_run_task(), this will trigger a NULL
    pointer dereference in nfs4_locku_prepare. For example:

    BUG: kernel NULL pointer dereference, address: 000000000000000c
    PGD 0 P4D 0
    Oops: Oops: 0000 [#1] SMP PTI
    CPU: 15 UID: 0 PID: 12 Comm: kworker/u64:0 Not tainted 6.15.0-rc2-dirty #60
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40
    Workqueue: rpciod rpc_async_schedule
    RIP: 0010:nfs4_locku_prepare+0x35/0xc2
    Code: 89 f2 48 89 fd 48 c7 c7 68 69 ef b5 53 48 8b 8e 90 00 00 00 48 89 f3
    RSP: 0018:ffffbbafc006bdb8 EFLAGS: 00010246
    RAX: 000000000000004b RBX: ffff9b964fc1fa00 RCX: 0000000000000000
    RDX: 0000000000000000 RSI: fffffffffffffff4 RDI: ffff9ba53fddbf40
    RBP: ffff9ba539934000 R08: 0000000000000000 R09: ffffbbafc006bc38
    R10: ffffffffb6b689c8 R11: 0000000000000003 R12: ffff9ba539934030
    R13: 0000000000000001 R14: 0000000004248060 R15: ffffffffb56d1c30
    FS: 0000000000000000(0000) GS:ffff9ba5881f0000(0000) knlGS:00000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 000000000000000c CR3: 000000093f244000 CR4: 00000000000006f0
    Call Trace:
     <TASK>
     __rpc_execute+0xbc/0x480
     rpc_async_schedule+0x2f/0x40
     process_one_work+0x232/0x5d0
     worker_thread+0x1da/0x3d0
     ? __pfx_worker_thread+0x10/0x10
     kthread+0x10d/0x240
     ? __pfx_kthread+0x10/0x10
     ret_from_fork+0x34/0x50
     ? __pfx_kthread+0x10/0x10
     ret_from_fork_asm+0x1a/0x30
     </TASK>
    Modules linked in:
    CR2: 000000000000000c
    ---[ end trace 0000000000000000 ]---

    Free the allocated nfs4_unlockdata when nfs_get_lock_context() fails and
    return NULL to terminate subsequent rpc_run_task, preventing NULL pointer
    dereference.

    Fixes: f30cb75 ("NFS: Always wait for I/O completion before unlock")
    Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
    Reviewed-by: Jeff Layton <jlayton@kernel.org>
    Link: https://lore.kernel.org/r/20250417072508.3850532-1-lilingfeng3@huawei.com
    Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>

Author: bcodding-rh

fs/nfs/nfs4proc.c

@@ -7045,18 +7045,25 @@ static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
 	struct nfs4_unlockdata *p;
 	struct nfs4_state *state = lsp->ls_state;
 	struct inode *inode = state->inode;
+	struct nfs_lock_context *l_ctx;
 
 	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (p == NULL)
 		return NULL;
+	l_ctx = nfs_get_lock_context(ctx);
+	if (!IS_ERR(l_ctx)) {
+		p->l_ctx = l_ctx;
+	} else {
+		kfree(p);
+		return NULL;
+	}
 	p->arg.fh = NFS_FH(inode);
 	p->arg.fl = &p->fl;
 	p->arg.seqid = seqid;
 	p->res.seqid = seqid;
 	p->lsp = lsp;
 	/* Ensure we don't close file until we're done freeing locks! */
 	p->ctx = get_nfs_open_context(ctx);
-	p->l_ctx = nfs_get_lock_context(ctx);
 	locks_init_lock(&p->fl);
 	locks_copy_lock(&p->fl, fl);
 	p->server = NFS_SERVER(inode);