Merge: CVE-2024-54456: NFS: Fix potential buffer overflowin nfs_sysfs_link_rpc_client()

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6448

JIRA: https://issues.redhat.com/browse/RHEL-81064
CVE: CVE-2024-54456

```
commit 49fd4e3
Author: Zichen Xie <[email protected]>
Date:   Wed Dec 18 00:13:12 2024 +0800

    NFS: Fix potential buffer overflowin nfs_sysfs_link_rpc_client()

    name is char[64] where the size of clnt->cl_program->name remains
    unknown. Invoking strcat() directly will also lead to potential buffer
    overflow. Change them to strscpy() and strncat() to fix potential
    issues.

    Signed-off-by: Zichen Xie <[email protected]>
    Reviewed-by: Benjamin Coddington <[email protected]>
    Signed-off-by: Anna Schumaker <[email protected]>```

Signed-off-by: CKI Backport Bot <[email protected]>

---

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Approved-by: Olga Kornievskaia <[email protected]>
Approved-by: Scott Mayhew <[email protected]>
Approved-by: CKI KWF Bot <[email protected]>

Merged-by: Augusto Caringi <[email protected]>

Author: caringi

fs/nfs/sysfs.c

@@ -280,9 +280,9 @@ void nfs_sysfs_link_rpc_client(struct nfs_server *server,
 	char name[RPC_CLIENT_NAME_SIZE];
 	int ret;
 
-	strcpy(name, clnt->cl_program->name);
-	strcat(name, uniq ? uniq : "");
-	strcat(name, "_client");
+	strscpy(name, clnt->cl_program->name, sizeof(name));
+	strncat(name, uniq ? uniq : "", sizeof(name) - strlen(name) - 1);
+	strncat(name, "_client", sizeof(name) - strlen(name) - 1);
 
 	ret = sysfs_create_link_nowarn(&server->kobj,
 						&clnt->cl_sysfs->kobject, name);