From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794061985; b=xovKJrLz7ndOJhpsynq4FwkzgY1oCvyuYbBwhjeDVY9CEDbeFHwStSFjnc39LxfajB6W /CYpR5IAU0YlcvmGvaUOJFnjsjuF/GzKleQKt5POHiAuJMWdInKCToYW4LqGlBhZpUgqV Ujjl0UjDzzEJJJ4WEgRbAnbg4bLQKq3Q/GX5Lbd20uHCzTn51Q062Q6UdzrgxqXLyWGsJ u/8yYkLV4hDfCcZdXVzWIWpvbeR2y1j6qmF7iZ0NmsaC7D/T/qRgf0BhsnJUBYDUdofZu JdLLh9A3SKv+R7ciHGD/PsURYxDCEmS5Fj/4dRkKy7kW9gmzmWm2tmgQ12RAPxzz0CQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794061985; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=WVDqm4q+jNU587JVQTP5si+AY7pJRXzChVVcZ6mDobg=; b=mfYcPuho8p6Pj2EJZvgX9K4iNP7nmzwowGhjJE+7rPkQePZ9UVOolSLr18cuoBAjMj6w Z1jOCMOctBTWaRm1qvBWh6/Og0OKJAfH7lMkee1UtU4ppjzp1JZTfs/GrWqSWB2HjhMMQ TIemAURuSUPlCz8KdZc63V5BfhU70hB5jz0oVL4SNbvmYu1Gu0nuKdC8y5BM8fsrvvz+l caPz35xTQn/Zl3PsuZYkTfJt2mxmmZlDb4mCdIuYYR9Yb3z7tQO8N5EB1GBA7lzxfFgQi 0yrveejPRKHOH7llXAQ+cpKJ2KHb1f6vb5wgUOIeVlVUVUIqDwBX/1UyHvnMBFlRtwQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b="yk/twkV6"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7DE38606A334; Sat, 7 Nov 2026 14:33:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=yk/twkV6 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2649B1F008A4; Sat, 7 Nov 2026 14:33:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794061985; bh=WVDqm4q+jNU587JVQTP5si+AY7pJRXzChVVcZ6mDobg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=yk/twkV6tZZBLhw6zERPZJ4b4kWOOkM9fhknp/daIyDk8dM1dP9XseSdyjxpx8wdy m/oaBj6ReEwDft3nmKjbBaocO7OHpp/wHClSCwXYX7Bhfx6sUAFH4VegsPqlrUYhkm 6LcMRj/+1ROiZ7CQ7YrGi9V/LxV6tqz+QOHKocqQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Runyu Xiao , Tom Lendacky , Herbert Xu , Sasha Levin , "Mario Limonciello (AMD)" Subject: [PATCH 6.12 0977/1536] crypto: ccp - Initialize DBC ioctl mutex before registering device Date: Sat, 7 Nov 2026 08:49:53 -0500 Message-ID: <20261107135025.088950898@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134957.653319350@linuxfoundation.org> References: <20261107134957.653319350@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Runyu Xiao [ Upstream commit e9b1d168f2a70c0764d5748893fdf631c504c171 ] 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 dynamic boost control") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20260829133410.1708684-1-runyu.xiao@seu.edu.cn/ Signed-off-by: Runyu Xiao Assisted-by: Codex:GPT-5 Reviewed-by: Tom Lendacky Reviewed-by: Mario Limonciello (AMD) > --- Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- 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 5b105a23f6997..c9a4431ec80e5 100644 --- a/drivers/crypto/ccp/dbc.c +++ b/drivers/crypto/ccp/dbc.c @@ -249,6 +249,8 @@ int dbc_dev_init(struct psp_device *psp) goto cleanup_mbox; } + mutex_init(&dbc_dev->ioctl_mutex); + dbc_dev->char_dev.minor = MISC_DYNAMIC_MINOR; dbc_dev->char_dev.name = "dbc"; dbc_dev->char_dev.fops = &dbc_fops; @@ -257,8 +259,6 @@ int dbc_dev_init(struct psp_device *psp) if (ret) goto cleanup_mbox; - mutex_init(&dbc_dev->ioctl_mutex); - return 0; cleanup_mbox: -- 2.53.0