On 4/27/21 6:00 PM, Jens Axboe wrote: > On 4/27/21 11:00 AM, Pavel Begunkov wrote: >> On 4/27/21 2:37 PM, Jens Axboe wrote: >>> On 4/27/21 6:51 AM, Palash Oswal wrote: >>>> syzkaller identified KASAN: null-ptr-deref Write in >>>> io_uring_cancel_sqpoll on v5.12 >>>> >>>> io_uring_cancel_sqpoll is called by io_sq_thread before calling >>>> io_uring_alloc_task_context. This leads to current->io_uring being >>>> NULL. io_uring_cancel_sqpoll should not have to deal with threads >>>> where current->io_uring is NULL. >>>> >>>> In order to cast a wider safety net, perform input sanitisation >>>> directly in io_uring_cancel_sqpoll and return for NULL value of >>>> current->io_uring. >>> >>> Thanks applied - I augmented the commit message a bit. >> >> btw, does it fixes the replied before syz report? Should >> syz fix or tag it if so. >> Reported-by: syzbot+be51ca5a4d97f017cd50@xxxxxxxxxxxxxxxxxxxxxxxxx > > That tag was already there. Oh, right, missed it -- Pavel Begunkov
