linux-kernel - Re: [PATCH] i2c: aspeed: Avoid accessing freed buffers during i2c transfers.

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Message-ID: <388f1d61-c419-a133-6266-daff1fa4cd60@linux.ibm.com>
Date:   Wed, 2 Aug 2023 08:41:16 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     Lei YU <mine260309@...il.com>, Joel Stanley <joel@....id.au>
Cc:     Lixue Liang <lianglixuehao@....com>,
        Lixue Liang <lianglixue@...atwall.com.cn>,
        linux-aspeed@...ts.ozlabs.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        brendan.higgins@...ux.dev, linux-i2c@...r.kernel.org,
        p.zabel@...gutronix.de, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] i2c: aspeed: Avoid accessing freed buffers during i2c
 transfers.


On 7/31/23 01:10, Lei YU wrote:
> There is a same fix in 
> https: //lore. kernel. org/openbmc/374237cb-1cda-df12-eb9f-7422cab51fc4@ linux. alibaba. com/ 
> On Mon, Jul 31, 2023 at 12: 21 PM Joel Stanley <joel@ jms. id. au> 
> wrote: On Fri, 28 Jul 2023 at 12: 40, Lixue Liang 
> <lianglixuehao@ 126. com>
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> There is a same fix in 
> https://lore.kernel.org/openbmc/374237cb-1cda-df12-eb9f-7422cab51fc4@linux.alibaba.com/
>
> On Mon, Jul 31, 2023 at 12:21 PM Joel Stanley <joel@....id.au> wrote:
>
>     On Fri, 28 Jul 2023 at 12:40, Lixue Liang <lianglixuehao@....com>
>     wrote:
>     >
>     > From: Lixue Liang <lianglixue@...atwall.com.cn>
>     >
>     > After waiting for the transmission timeout, the I2C controller will
>     > continue to transmit data when the bus is idle. Clearing
>     bus->msg will
>     > avoid kernel panic when accessing the freed msg->buf in
>     > aspeed_i2c_master_irq.
>     >
>     > Signed-off-by: Lixue Liang <lianglixue@...atwall.com.cn>
>     > ---
>     >  drivers/i2c/busses/i2c-aspeed.c | 2 ++
>     >  1 file changed, 2 insertions(+)
>     >
>     > diff --git a/drivers/i2c/busses/i2c-aspeed.c
>     b/drivers/i2c/busses/i2c-aspeed.c
>     > index 2e5acfeb76c8..c83057497e26 100644
>     > --- a/drivers/i2c/busses/i2c-aspeed.c
>     > +++ b/drivers/i2c/busses/i2c-aspeed.c
>     > @@ -713,6 +713,8 @@ static int aspeed_i2c_master_xfer(struct
>     i2c_adapter *adap,
>     >                 spin_lock_irqsave(&bus->lock, flags);
>     >                 if (bus->master_state == ASPEED_I2C_MASTER_PENDING)
>     >                         bus->master_state =
>     ASPEED_I2C_MASTER_INACTIVE;
>     > +
>     > +               bus->msgs = NULL;
>
>     Eddie, is this the same issue you were debugging?
>

Yes, it is, and the same fix I settled on.


>
>     >  spin_unlock_irqrestore(&bus->lock, flags);
>     >
>     >                 return -ETIMEDOUT;
>     > --
>     > 2.27.0
>     >
>