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Sat, 12 Dec 2020 01:35:13 -0800 (PST) Date: Sat, 12 Dec 2020 15:04:54 +0530 From: Syed Nayyar Waris To: linus.walleij@linaro.org, akpm@linux-foundation.org Subject: [PATCH v2 2/2] gpio: xilinx: Add extra check if sum of widths exceed 64 Message-ID: <7049b151670d3cb3ca190185bb484a79b2d5d845.1607765148.git.syednwaris@gmail.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201212_043516_024490_E807590A X-CRM114-Status: GOOD ( 14.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, amit.kucheria@verdurent.com, arnd@arndb.de, yamada.masahiro@socionext.com, linux-kernel@vger.kernel.org, linus.walleij@linaro.org, daniel.lezcano@linaro.org, vilhelm.gray@gmail.com, michal.simek@xilinx.com, bgolaszewski@baylibre.com, rrichter@marvell.com, linux-gpio@vger.kernel.org, linux-pm@vger.kernel.org, rui.zhang@intel.com, andriy.shevchenko@linux.intel.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add extra check to see if sum of widths does not exceed 64. If it exceeds then return -EINVAL alongwith appropriate error message. Cc: Michal Simek Signed-off-by: Syed Nayyar Waris --- drivers/gpio/gpio-xilinx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index 05dae086c4d0..a2e92a1cf50b 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -340,6 +340,12 @@ static int xgpio_probe(struct platform_device *pdev) chip->gc.base = -1; chip->gc.ngpio = chip->gpio_width[0] + chip->gpio_width[1]; + + if (chip->gc.ngpio > 64) { + dev_err(&pdev->dev, "invalid configuration: number of GPIO is greater than 64"); + return -EINVAL; + } + chip->gc.parent = &pdev->dev; chip->gc.direction_input = xgpio_dir_in; chip->gc.direction_output = xgpio_dir_out;