linux-kernel - [PATCH v5 1/2] axis-fifo: use devm_kasprintf() for allocating formatted strings

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Date:   Fri, 16 Jun 2023 20:55:59 +0530
From:   Prathu Baronia <prathubaronia2011@...il.com>
To:     prathubaronia2011@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Khadija Kamran <kamrankhadijadj@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     dan.carpenter@...aro.org, error27@...il.com, lkp@...el.com,
        oe-kbuild-all@...ts.linux.dev, oe-kbuild@...ts.linux.dev
Subject: [PATCH v5 1/2] axis-fifo: use devm_kasprintf() for allocating formatted strings

In various places, string buffers of a fixed size are allocated, and
filled using snprintf() with the same fixed size, which is error-prone.

Replace this by calling devm_kasprintf() instead, which always uses the
appropriate size. Allocate the device name with a unique identifier
instead of a kernel address.

Signed-off-by: Prathu Baronia <prathubaronia2011@...il.com>
---
V4 -> V5: Remove the dev_info() and use a unique identifier for dev name
V3 -> V4: Split into warning fixing and cleanup commits
V2 -> V3: Fix smatch warnings from kernel test robot
V1 -> V2: Split into logical commits and fix commit message

 drivers/staging/axis-fifo/axis-fifo.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c
index 7a21f2423204..5e070e00e27a 100644
--- a/drivers/staging/axis-fifo/axis-fifo.c
+++ b/drivers/staging/axis-fifo/axis-fifo.c
@@ -816,10 +816,6 @@ static int axis_fifo_probe(struct platform_device *pdev)
 	 * ----------------------------
 	 */
 
-	device_name = devm_kzalloc(dev, 32, GFP_KERNEL);
-	if (!device_name)
-		return -ENOMEM;
-
 	/* allocate device wrapper memory */
 	fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL);
 	if (!fifo)
@@ -857,7 +853,11 @@ static int axis_fifo_probe(struct platform_device *pdev)
 	dev_dbg(fifo->dt_device, "remapped memory to 0x%p\n", fifo->base_addr);
 
 	/* create unique device name */
-	snprintf(device_name, 32, "%s_%pa", DRIVER_NAME, &r_mem->start);
+	device_name = devm_kasprintf(dev, GFP_KERNEL, "%s_%d", DRIVER_NAME, pdev->id);
+	if (!device_name) {
+		rc = -ENOMEM;
+		goto err_initial;
+	}
 	dev_dbg(fifo->dt_device, "device name [%s]\n", device_name);
 
 	/* ----------------------------

base-commit: fb054096aea0576f0c0a61c598e5e9676443ee86
-- 
2.34.1