linux-kernel - Re: [PATCH 0/4] treewide: fix interrupted release

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Date:   Thu, 10 Oct 2019 15:50:43 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Johan Hovold <johan@...nel.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Fabien Dessenne <fabien.dessenne@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-s390@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 0/4] treewide: fix interrupted release

On Thu, Oct 10, 2019 at 03:13:29PM +0200, Johan Hovold wrote:
> Two old USB drivers had a bug in them which could lead to memory leaks
> if an interrupted process raced with a disconnect event.
> 
> Turns out we had a few more driver in other subsystems with the same
> kind of bug in them.
> 
> Note that all but the s390 patch have only been compile tested, while
> the s390 one has not even been built.

Random funny idea: Could we do some debug annotations (akin to
might_sleep) that splats when you might_sleep_interruptible somewhere
where interruptible sleeps are generally a bad idea? Like in
fops->release?

Something like non_block_start/end that I've recently done, but for
interruptible sleeps only? Would need might_sleep_interruptibly()
annotations and non_interruptly_sleep_start/end annotations.
-Daniel

> 
> Johan
> 
> 
> Johan Hovold (4):
>   drm/msm: fix memleak on release
>   media: bdisp: fix memleak on release
>   media: radio: wl1273: fix interrupt masking on release
>   s390/zcrypt: fix memleak at release
> 
>  drivers/gpu/drm/msm/msm_debugfs.c             | 6 +-----
>  drivers/media/platform/sti/bdisp/bdisp-v4l2.c | 3 +--
>  drivers/media/radio/radio-wl1273.c            | 3 +--
>  drivers/s390/crypto/zcrypt_api.c              | 3 +--
>  4 files changed, 4 insertions(+), 11 deletions(-)
> 
> -- 
> 2.23.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch