linux-kernel - Re: [PATCH v2] i2c: dev: zero out array used for i2c reads from userspace

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Message-ID: <YRLnr24IBwe5HS+j@kunai>
Date:   Tue, 10 Aug 2021 22:55:11 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH v2] i2c: dev: zero out array used for i2c reads from
 userspace

On Thu, Jul 29, 2021 at 04:35:32PM +0200, Greg Kroah-Hartman wrote:
> If an i2c driver happens to not provide the full amount of data that a
> user asks for, it is possible that some uninitialized data could be sent
> to userspace.  While all in-kernel drivers look to be safe, just be sure
> by initializing the buffer to zero before it is passed to the i2c driver
> so that any future drivers will not have this issue.
> 
> Also properly copy the amount of data recvieved to the userspace buffer,
> as pointed out by Dan Carpenter.
> 
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Dan Carpenter <dan.carpenter@...cle.com>
> Cc: stable <stable@...r.kernel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Fixed checkpatch warning "WARNING: Invalid email format for stable:
'stable <stable@...r.kernel.org>', prefer 'stable@...r.kernel.org' " and
applied to for-current, thanks!


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