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. -- Jens Axboe
