In wm97xx_ts_input_open(), there is an if statement on line 507 to check whether wm->mach_ops is NULL: if (wm->mach_ops && wm->mach_ops->acc_enabled)
When wm->mach_ops is NULL, it is used on line 521: wm97xx_init_pen_irq(wm); BUG_ON(!wm->mach_ops->irq_enable); BUG_ON(!wm->mach_ops->irq_gpio); wm97xx_reg_write(..., reg & ~(wm->mach_ops->irq_gpio)) Thus, possible null-pointer dereferences may occur. To fix these bugs, wm->mach_ops is checked at the beginning of wm97xx_init_pen_irq(). These bugs found by a static analysis tool STCheck written by us. Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com> --- v2: * Add a new check of wm->mach_ops in wm97xx_init_pen_irq(). Thank Charles for helpful advice. --- drivers/input/touchscreen/wm97xx-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c index 0a174bd82915..50b016abf492 100644 --- a/drivers/input/touchscreen/wm97xx-core.c +++ b/drivers/input/touchscreen/wm97xx-core.c @@ -374,6 +374,9 @@ static int wm97xx_init_pen_irq(struct wm97xx *wm) { u16 reg; + if (!wm->mach_ops) + return -EINVAL; + /* If an interrupt is supplied an IRQ enable operation must also be * provided. */ BUG_ON(!wm->mach_ops->irq_enable); -- 2.17.0