tipc: use kfree_sensitive() for aead cleanup

JIRA: https://issues.redhat.com/browse/RHEL-115652
Tested: compile only

commit c8ef20f
Author: Zilin Guan <zilin@seu.edu.cn>
Date:   Fri May 23 11:47:17 2025 +0000

    tipc: use kfree_sensitive() for aead cleanup

    The tipc_aead_free() function currently uses kfree() to release the aead
    structure. However, this structure contains sensitive information, such
    as key's SALT value, which should be securely erased from memory to
    prevent potential leakage.

    To enhance security, replace kfree() with kfree_sensitive() when freeing
    the aead structure. This change ensures that sensitive data is explicitly
    cleared before memory deallocation, aligning with the approach used in
    tipc_aead_init() and adhering to best practices for handling confidential
    information.

    Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
    Reviewed-by: Tung Nguyen <tung.quang.nguyen@est.tech>
    Link: https://patch.msgid.link/20250523114717.4021518-1-zilin@seu.edu.cn
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Xin Long <lxin@redhat.com>

Author: Xin Long

net/tipc/crypto.c

@@ -425,7 +425,7 @@ static void tipc_aead_free(struct rcu_head *rp)
 	}
 	free_percpu(aead->tfm_entry);
 	kfree_sensitive(aead->key);
-	kfree(aead);
+	kfree_sensitive(aead);
 }
 
 static int tipc_aead_users(struct tipc_aead __rcu *aead)