From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 7AAAD2F8BE7; Tue, 12 Aug 2025 17:56:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755021396; cv=none; b=C5Xt09bvCnvfTdbkkUCTQwz+4qo+FzlJtz+Q53vPZW5tHpxMk3rP9nrNZ95aGKmtPohRRYUj7OvHohydCHYr43F6AsAj79AvNJepX/kyKqGcAZsluzihPef0p75zejXKTBIcJIeaNNJnVT8jxdEr74VA23raiSKyS6GKvMmAlAs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755021396; c=relaxed/simple; bh=OUulELiT+f0XcEB4dKu8X3VMv5lOFHb6YurjRvgU/6A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oOvFXmb2Ba0j5JiXbvF3gT10BRXqLrJOGMi9YXMNkJ8p3AU/mQvorofsiby0Vd4MSSBt9TcpJhl/+uGTvcsLA0qRqoAmcFG5zJfdH0nJ1Rec56IzDTVXx0QjFIK8ifd31J9AHW09RdR0VxOpnSsc+d86GG1X9VER/VJf0mbmfbA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Xf/SMVlC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Xf/SMVlC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED6B1C4CEF0; Tue, 12 Aug 2025 17:56:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755021396; bh=OUulELiT+f0XcEB4dKu8X3VMv5lOFHb6YurjRvgU/6A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xf/SMVlCtam7Zr2Ev0uGJBYxtl82PXL3RbI0r2tnt+2CiuRTosiUHb2y53vnbmD3a zdglo+5g9niXr1T3BbHMhA+1fatNiJezu5ltiQ8vG1UqbrIuVIiZ9zDWvaNPuuycoA XXMnu/nCtm21Oqn9zWAuobiY1VjYNE5Y0w8bU3O4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Suman Kumar Chakraborty , Giovanni Cabiddu , Herbert Xu , Sasha Levin Subject: [PATCH 6.6 109/262] crypto: qat - use unmanaged allocation for dc_data Date: Tue, 12 Aug 2025 19:28:17 +0200 Message-ID: <20250812172957.729555885@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250812172952.959106058@linuxfoundation.org> References: <20250812172952.959106058@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Suman Kumar Chakraborty [ Upstream commit 4cc871ad0173e8bc22f80e3609e34d546d30ef1a ] The dc_data structure holds data required for handling compression operations, such as overflow buffers. In this context, the use of managed memory allocation APIs (devm_kzalloc() and devm_kfree()) is not necessary, as these data structures are freed and re-allocated when a device is restarted in adf_dev_down() and adf_dev_up(). Additionally, managed APIs automatically handle memory cleanup when the device is detached, which can lead to conflicts with manual cleanup processes. Specifically, if a device driver invokes the adf_dev_down() function as part of the cleanup registered with devm_add_action_or_reset(), it may attempt to free memory that is also managed by the device's resource management system, potentially leading to a double-free. This might result in a warning similar to the following when unloading the device specific driver, for example qat_6xxx.ko: qat_free_dc_data+0x4f/0x60 [intel_qat] qat_compression_event_handler+0x3d/0x1d0 [intel_qat] adf_dev_shutdown+0x6d/0x1a0 [intel_qat] adf_dev_down+0x32/0x50 [intel_qat] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1c1/0x200 driver_detach+0x48/0x90 bus_remove_driver+0x74/0xf0 pci_unregister_driver+0x2e/0xb0 Use unmanaged memory allocation APIs (kzalloc_node() and kfree()) for the dc_data structure. This ensures that memory is explicitly allocated and freed under the control of the driver code, preventing manual deallocation from interfering with automatic cleanup. Fixes: 1198ae56c9a5 ("crypto: qat - expose deflate through acomp api for QAT GEN2") Signed-off-by: Suman Kumar Chakraborty Reviewed-by: Giovanni Cabiddu Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/intel/qat/qat_common/qat_compression.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/intel/qat/qat_common/qat_compression.c b/drivers/crypto/intel/qat/qat_common/qat_compression.c index 7842a9f22178..2c3aa89b316a 100644 --- a/drivers/crypto/intel/qat/qat_common/qat_compression.c +++ b/drivers/crypto/intel/qat/qat_common/qat_compression.c @@ -197,7 +197,7 @@ static int qat_compression_alloc_dc_data(struct adf_accel_dev *accel_dev) struct adf_dc_data *dc_data = NULL; u8 *obuff = NULL; - dc_data = devm_kzalloc(dev, sizeof(*dc_data), GFP_KERNEL); + dc_data = kzalloc_node(sizeof(*dc_data), GFP_KERNEL, dev_to_node(dev)); if (!dc_data) goto err; @@ -235,7 +235,7 @@ static void qat_free_dc_data(struct adf_accel_dev *accel_dev) dma_unmap_single(dev, dc_data->ovf_buff_p, dc_data->ovf_buff_sz, DMA_FROM_DEVICE); kfree_sensitive(dc_data->ovf_buff); - devm_kfree(dev, dc_data); + kfree(dc_data); accel_dev->dc_data = NULL; } -- 2.39.5