linux-kernel - [PATCH] crypto: qat - Replace kzalloc() + copy_from_user() with memdup

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Message-ID: <20250905163915.523396-1-thorsten.blum@linux.dev>
Date: Fri,  5 Sep 2025 18:39:11 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg KH <gregkh@...uxfoundation.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	qat-linux@...el.com,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: qat - Replace kzalloc() + copy_from_user() with memdup_user()

Replace kzalloc() followed by copy_from_user() with memdup_user() to
improve and simplify adf_ctl_alloc_resources(). memdup_user() returns
either -ENOMEM or -EFAULT (instead of -EIO) if an error occurs.

Remove the unnecessary device id initialization, since memdup_user()
(like copy_from_user()) immediately overwrites it.

No functional changes intended other than returning the more idiomatic
error code -EFAULT.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c b/drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c
index 48c62a14a6a7..84bc89e16742 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c
@@ -94,17 +94,10 @@ static int adf_ctl_alloc_resources(struct adf_user_cfg_ctl_data **ctl_data,
 {
 	struct adf_user_cfg_ctl_data *cfg_data;
 
-	cfg_data = kzalloc(sizeof(*cfg_data), GFP_KERNEL);
-	if (!cfg_data)
-		return -ENOMEM;
-
-	/* Initialize device id to NO DEVICE as 0 is a valid device id */
-	cfg_data->device_id = ADF_CFG_NO_DEVICE;
-
-	if (copy_from_user(cfg_data, (void __user *)arg, sizeof(*cfg_data))) {
+	cfg_data = memdup_user((void __user *)arg, sizeof(*cfg_data));
+	if (IS_ERR(cfg_data)) {
 		pr_err("QAT: failed to copy from user cfg_data.\n");
-		kfree(cfg_data);
-		return -EIO;
+		return PTR_ERR(cfg_data);
 	}
 
 	*ctl_data = cfg_data;
-- 
2.51.0