From nobody Sat Sep 26 22:02:19 2026 Received: from mail-m49198.qiye.163.com (mail-m49198.qiye.163.com [45.254.49.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D51F7223323; Sat, 29 Aug 2026 13:34:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.254.49.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788010472; cv=none; b=OaWmEDkFtsMGRbqFFt7jwgT9GWkse58rtioqiW97W/HTKb4IphgzwJ46wWcLFjDdVoYk15EfG1L5JG5AND2DOQa3fsoNNa6NwxynP/FaCeSv5nzAf4nfYQHmPEYGu6UzYa7WnarF0C2r14zHm7jRj6P+jzSiJn5sYrT2XfcwPJo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788010472; c=relaxed/simple; bh=sj2FbP662UfTlUjAdQZKBbfB9RMpolU9yUOO3V3+jlU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=XnqTJyVO5eOogoAueEcRIEglO41awTvTq+tnEz32BwKluMA1hBFPA8SDMzZ3t9pU/m1uJm+3E1bCGipB6wrl7KN3y1HuskqIg1yYGuGAlxqJCyVVcyuuFnbL+hb6Zs3qphLM7U8dLjh3oo88UyUxtFHdqxKZ+/BCv1TxPl8Jsoc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=seu.edu.cn; spf=pass smtp.mailfrom=seu.edu.cn; dkim=pass (1024-bit key) header.d=seu.edu.cn header.i=@seu.edu.cn header.b=EVUy7K8Y; arc=none smtp.client-ip=45.254.49.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=seu.edu.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=seu.edu.cn Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=seu.edu.cn header.i=@seu.edu.cn header.b="EVUy7K8Y" Received: from PC-202605011814.localdomain (unknown [58.241.16.34]) by smtp.qiye.163.com (Hmail) with ESMTP id 4bcbd04cd; Sat, 29 Aug 2026 21:34:15 +0800 (GMT+08:00) From: Runyu Xiao To: mario.limonciello@amd.com Cc: runyu.xiao@seu.edu.cn, jianhao.xu@seu.edu.cn, thomas.lendacky@amd.com, john.allen@amd.com, herbert@gondor.apana.org.au, davem@davemloft.net, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] crypto: ccp: Initialize DBC ioctl mutex before registering device Date: Sat, 29 Aug 2026 21:34:10 +0800 Message-Id: <20260829133410.1708684-1-runyu.xiao@seu.edu.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-HM-Tid: 0aa04dba607d03a1kunmfc30c173d0b66 X-HM-MType: 10 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVkZGUkZVh0dTh9JSk8ZGU4eS1YeHw 5VEwETFhoSFyQUDg9ZV1kYEgtZQVlOQ1VJT0pVSk1VSE9ZV1kWGg8SFR0UWUFZT0tIVUpLSEpPSE xVSktLVUpCS0tZBg++ DKIM-Signature: a=rsa-sha256; b=EVUy7K8Y0chtFRbLbueu1YAq6XDxThYcLXwKbGy5mEqnpsHYndNEA1VpNtQdXW0TzmeqAgPXVASqTrb/IngOctDFkhF42206XLCferCdsOO9WLzQiTxsR36lRxDTz4DE6O9SCelHnGfLhQB0Gdj+D2WSkHxhqnbW2yhV5vBrdUk=; s=default; c=relaxed/relaxed; d=seu.edu.cn; v=1; bh=yd9YtTllAlHctJiIZ5KUYqP4tsI/lD2hZypzZeaVt/g=; h=date:mime-version:subject:message-id:from; Content-Type: text/plain; charset="utf-8" dbc_dev_init() registers the DBC misc device before initializing ioctl_mutex. Once misc_register() publishes the device, userspace can open it and invoke dbc_ioctl() while the mutex is still uninitialized. Initialize ioctl_mutex before calling misc_register() so the published ioctl callback always sees an initialized mutex. Fixes: c04cf9e14f10 ("crypto: ccp - Add support for fetching a nonce for dy= namic boost control") Cc: stable@vger.kernel.org Signed-off-by: Runyu Xiao Assisted-by: Codex:GPT-5 Reviewed-by: Mario Limonciello (AMD) > --- --- drivers/crypto/ccp/dbc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/ccp/dbc.c b/drivers/crypto/ccp/dbc.c index 410084a90..00c864413 100644 --- a/drivers/crypto/ccp/dbc.c +++ b/drivers/crypto/ccp/dbc.c @@ -240,12 +240,12 @@ int dbc_dev_init(struct psp_device *psp) dbc_dev->char_dev.name =3D "dbc"; dbc_dev->char_dev.fops =3D &dbc_fops; dbc_dev->char_dev.mode =3D 0600; + mutex_init(&dbc_dev->ioctl_mutex); + ret =3D misc_register(&dbc_dev->char_dev); if (ret) goto cleanup_mbox; =20 - mutex_init(&dbc_dev->ioctl_mutex); - return 0; =20 cleanup_mbox: