lkml.org 
[lkml]   [2022]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] dispnv50: atom: fix an incorrect NULL check on list iterator
On Sun, 27 Mar 2022 at 08:39, Xiaomeng Tong <xiam0nd.tong@gmail.com> wrote:
>
> The bug is here:
> return encoder;
>
> The list iterator value 'encoder' will *always* be set and non-NULL
> by drm_for_each_encoder_mask(), so it is incorrect to assume that the
> iterator value will be NULL if the list is empty or no element found.
> Otherwise it will bypass some NULL checks and lead to invalid memory
> access passing the check.
>
> To fix this bug, just return 'encoder' when found, otherwise return
> NULL.
>

Isn't this covered by the upcoming list* iterator rework [1] or is
this another iterator glitch?
IMHO we should be looking at fixing the implementation and not the
hundreds of users through the kernel.

HTH
-Emil
[1] https://lwn.net/Articles/887097/

\
 
 \ /
  Last update: 2022-03-27 18:00    [W:0.043 / U:1.708 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site