On 8/4/20 9:40 PM, Guoyu Huang wrote: > when ctx->sqo_mm is zero, io_sq_wq_submit_work() frees 'req' > without deleting it from 'task_list'. After that, 'req' is > accessed in io_ring_ctx_wait_and_kill() which lead to > a use-after-free.
This looks like an old one, that affects 5.4 only. I've massaged it to apply on top of another fix, will ask to get it queued up for stable. Thanks! -- Jens Axboe
