From 049d75f72d9b1cce0f5ca66ea324f0b5318046eb Mon Sep 17 00:00:00 2001 From: Mike Dunn Date: Wed, 18 Sep 2013 08:07:41 -0700 Subject: [PATCH] Input: pxa27x_keypad - fix NULL pointer dereference A NULL pointer dereference exception occurs in the driver probe function when device tree is used. The pdata pointer will be NULL in this case, but the code dereferences it in all cases. When device tree is used, a platform data structure is allocated and initialized, and in all cases this pointer is copied to the driver's private data, so the variable being tested should be accessed through the driver's private data structure. Signed-off-by: Mike Dunn Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/pxa27x_keypad.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c index 134c3b404a54..a2e758d27584 100644 --- a/drivers/input/keyboard/pxa27x_keypad.c +++ b/drivers/input/keyboard/pxa27x_keypad.c @@ -786,10 +786,17 @@ static int pxa27x_keypad_probe(struct platform_device *pdev) input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); input_set_capability(input_dev, EV_MSC, MSC_SCAN); - if (pdata) + if (pdata) { error = pxa27x_keypad_build_keycode(keypad); - else + } else { error = pxa27x_keypad_build_keycode_from_dt(keypad); + /* + * Data that we get from DT resides in dynamically + * allocated memory so we need to update our pdata + * pointer. + */ + pdata = keypad->pdata; + } if (error) { dev_err(&pdev->dev, "failed to build keycode\n"); goto failed_put_clk;