lkml.org 
[lkml]   [2020]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 5.6] io_uring: NULL-deref for IOSQE_{ASYNC,DRAIN}
From
Date
On 3/13/20 1:29 PM, Pavel Begunkov wrote:
> Processing links, io_submit_sqe() prepares requests, drops sqes, and
> passes them with sqe=NULL to io_queue_sqe(). There IOSQE_DRAIN and/or
> IOSQE_ASYNC requests will go through the same prep, which doesn't expect
> sqe=NULL and fail with NULL pointer deference.
>
> Always do full prepare including io_alloc_async_ctx() for linked
> requests, and then it can skip the second preparation.

Thanks, applied.

--
Jens Axboe

\
 
 \ /
  Last update: 2020-03-15 04:38    [W:0.047 / U:0.388 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site