linux-kernel - Re: [PATCH 0/3] can: fix same memory leaks in can drivers

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Message-ID: <20210726202916.5945e3d9@gmail.com>
Date:   Mon, 26 Jul 2021 20:29:16 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     wg@...ndegger.com, mkl@...gutronix.de, davem@...emloft.net,
        socketcan@...tkopp.net, mailhol.vincent@...adoo.fr,
        b.krumboeck@...il.com, haas@...-wuensche.com, Stefan.Maetje@....eu,
        matthias.fuchs@....eu
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] can: fix same memory leaks in can drivers

On Mon, 26 Jul 2021 18:29:38 +0300
Pavel Skripkin <paskripkin@...il.com> wrote:

> Hi, Marc and can drivers maintainers/reviewers!
> 

I reread this I found out, that I missed logic here.

I mean:

> A long time ago syzbot reported memory leak in mcba_usb can
> driver[1]. It was using strange pattern for allocating coherent
> buffers, which was leading to memory leaks.

I fixed this wrong pattern in mcba_usb driver and 

> Yesterday I got a report,
> that mcba_usb stopped working since my commit. I came up with quick
> fix and all started working well.
> 
> There are at least 3 more drivers with this pattern, I decided to fix
> leaks in them too, since code is actually the same (I guess, driver
> authors just copy pasted code parts). Each of following patches is
> combination of 91c02557174b ("can: mcba_usb: fix memory leak in
> mcba_usb") and my yesterday fix [2].
> 
> 
> Dear maintainers/reviewers, if You have one of these hardware pieces,
> please, test these patches and report any errors you will find.
> 
> [1]
> https://syzkaller.appspot.com/bug?id=c94c1c23e829d5ac97995d51219f0c5a0cd1fa54
> [2]
> https://lore.kernel.org/netdev/20210725103630.23864-1-paskripkin@gmail.com/
> 
> 
> With regards,
> Pavel Skripkin
> 
> Pavel Skripkin (3):
>   can: usb_8dev: fix memory leak
>   can: ems_usb: fix memory leak
>   can: esd_usb2: fix memory leak
> 
>  drivers/net/can/usb/ems_usb.c  | 14 +++++++++++++-
>  drivers/net/can/usb/esd_usb2.c | 16 +++++++++++++++-
>  drivers/net/can/usb/usb_8dev.c | 15 +++++++++++++--
>  3 files changed, 41 insertions(+), 4 deletions(-)
> 



With regards,
Pavel Skripkin