On Fri, Jul 26, 2019 at 06:23:26PM +0800, Jia-Ju Bai wrote: > 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 <baijiaju1990@xxxxxxxxx> > --- > v2: > * Add a new check of wm->mach_ops in wm97xx_init_pen_irq(). > Thank Charles for helpful advice. > > v3: > * Print a message if wm->mach_ops is NULL in wm97xx_init_pen_irq(). > Thank Charles for helpful advice. > > --- Acked-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx> Thanks, Charles
