lkml.org 
[lkml]   [2015]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v5 1/3] tty: fix data race in flush_to_ldisc
From
On Thu, Sep 17, 2015 at 11:17 AM, Dmitry Vyukov <dvyukov@google.com> wrote:
> flush_to_ldisc reads port->itty and checks that it is not NULL,
> concurrently release_tty sets port->itty to NULL. It is possible
> that flush_to_ldisc loads port->itty once, ensures that it is
> not NULL, but then reloads it again and uses. The second load
> can already return NULL, which will cause a crash.
>
> Use READ_ONCE to read port->itty.
>
> The data race was found with KernelThreadSanitizer (KTSAN).

Reviewed-by: Peter Hurley <peter@hurleysoftware.com>


\
 
 \ /
  Last update: 2015-09-17 20:01    [W:0.084 / U:0.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site