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([49.207.202.99]) by smtp.gmail.com with ESMTPSA id jn9-20020a170903050900b001ac741dfd29sm1506647plb.295.2023.05.18.07.52.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 May 2023 07:52:03 -0700 (PDT) From: Prathu Baronia To: prathubaronia2011@gmail.com Cc: dan.carpenter@linaro.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev, lkp@intel.com, oe-kbuild-all@lists.linux.dev, oe-kbuild@lists.linux.dev, Dan Carpenter Subject: [PATCH v3 1/2] axis-fifo: use devm_kasprintf() for allocating formatted strings Date: Thu, 18 May 2023 20:21:53 +0530 Message-Id: <20230518145154.33377-1-prathubaronia2011@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Also fix an old smatch warning reported by lkp introduced by commit d2d7aa53891e. In the mentioned commit we had used "%pa" format specifier for a void* type and hence smatch complained about its use instead of "%p". Fixes: d2d7aa53891e ("staging: axis-fifo: convert to use miscdevice") Reported-by: kernel test robot Reported-by: Dan Carpenter Link: https://lore.kernel.org/r/202305150358.nt1BkbXz-lkp@intel.com/ Signed-off-by: Prathu Baronia --- 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 | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c index 7a21f2423204..d71bdc6dd961 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_%pa", DRIVER_NAME, &r_mem->start); + if (!device_name) { + rc = -ENOMEM; + goto err_initial; + } dev_dbg(fifo->dt_device, "device name [%s]\n", device_name); /* ---------------------------- @@ -906,8 +906,8 @@ static int axis_fifo_probe(struct platform_device *pdev) if (rc < 0) goto err_initial; - dev_info(fifo->dt_device, "axis-fifo created at %pa mapped to 0x%pa, irq=%i\n", - &r_mem->start, &fifo->base_addr, fifo->irq); + dev_info(fifo->dt_device, "axis-fifo created at %pa mapped to 0x%p, irq=%i\n", + &r_mem->start, fifo->base_addr, fifo->irq); return 0; base-commit: 4d6d4c7f541d7027beed4fb86eb2c451bd8d6fff -- 2.34.1