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

[Wolfram Sang]

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@xxxxxxxxxx>
> Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Cc: stable <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

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