From: Wolfram Sang <wsa@the-dreams.de>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Jean Delvare <khali@linux-fr.org>,
Daniel Kurtz <djkurtz@chromium.org>,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
syzbot <syzbot+ed71512d469895b5b34e@syzkaller.appspotmail.com>,
Jarkko Nikula <jarkko.nikula@linux.intel.com>
Subject: Re: [PATCH] i2c: i801: Fix memory corruption in i801_isr_byte_done()
Date: Sat, 22 Feb 2020 13:45:23 +0100 [thread overview]
Message-ID: <20200222124523.GI1716@kunai> (raw)
In-Reply-To: <20200114073406.qaq3hbrhtx76fkes@kili.mountain>
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On Tue, Jan 14, 2020 at 10:34:06AM +0300, Dan Carpenter wrote:
> Assigning "priv->data[-1] = priv->len;" obviously doesn't make sense.
> What it does is it ends up corrupting the last byte of priv->len so
> priv->len becomes a very high number.
>
> Reported-by: syzbot+ed71512d469895b5b34e@syzkaller.appspotmail.com
> Fixes: d3ff6ce40031 ("i2c-i801: Enable IRQ for byte_by_byte transactions")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
Daniel, Jean: what do you think?
Also, adding Jarkko to CC who works a lot with this driver...
> Untested.
>
> drivers/i2c/busses/i2c-i801.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
> index f5e69fe56532..420d8025901e 100644
> --- a/drivers/i2c/busses/i2c-i801.c
> +++ b/drivers/i2c/busses/i2c-i801.c
> @@ -584,7 +584,6 @@ static void i801_isr_byte_done(struct i801_priv *priv)
> "SMBus block read size is %d\n",
> priv->len);
> }
> - priv->data[-1] = priv->len;
> }
>
> /* Read next byte */
> --
> 2.11.0
>
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next prev parent reply other threads:[~2020-02-22 12:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 6:34 KASAN: vmalloc-out-of-bounds Write in i801_isr syzbot
2020-01-14 7:34 ` [PATCH] i2c: i801: Fix memory corruption in i801_isr_byte_done() Dan Carpenter
2020-02-22 12:45 ` Wolfram Sang [this message]
2020-03-20 14:57 ` Wolfram Sang
2020-03-22 18:08 ` Jean Delvare
2020-03-22 21:10 ` Andy Shevchenko
2020-03-22 21:12 ` Wolfram Sang
2020-03-22 22:11 ` Jean Delvare
2020-03-23 9:37 ` Dan Carpenter
2020-03-23 17:51 ` Jean Delvare
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