On Sat, May 15, 2021 at 11:02:38PM +0200, Peter Zijlstra wrote: > On Sat, May 15, 2021 at 05:46:45PM +0100, Khaled ROMDHANI wrote: > > The 'curr' variable could be NULL and derefrenced by > > pick_next_entity. Fix this by adding a check that prevent > > the invocation of pick_next_entity with a NULL passed argument. > > And why exactly is that a problem? > Within pick_next_entity, we could have 'left = curr'. Thus the function wakeup_preempt_entity which is invoked from pick_next_entity, derefrence the the sched entity 'left' that may be a NULL passed argument.
