linux-kernel - Re: [PATCH v1] HID: make arrays usage and value to be the same

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Message-ID: <X8tMDQTls/RcTSAy@kroah.com>
Date:   Sat, 5 Dec 2020 09:59:57 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Will McVicker <willmcvicker@...gle.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        security@...nel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Will Coster <willcoster@...gle.com>
Subject: Re: [PATCH v1] HID: make arrays usage and value to be the same

On Sat, Dec 05, 2020 at 12:48:48AM +0000, Will McVicker wrote:
> The HID subsystem allows an "HID report field" to have a different
> number of "values" and "usages" when it is allocated. When a field
> struct is created, the size of the usage array is guaranteed to be at
> least as large as the values array, but it may be larger. This leads to
> a potential out-of-bounds write in
> __hidinput_change_resolution_multipliers() and an out-of-bounds read in
> hidinput_count_leds().
> 
> To fix this, let's make sure that both the usage and value arrays are
> the same size.
> 
> Signed-off-by: Will McVicker <willmcvicker@...gle.com>

Any reason not to also add a cc: stable on this?

And, has this always been the case, or was this caused by some specific
commit in the past?  If so, a "Fixes:" tag is always nice to included.

And finally, as you have a fix for this already, no need to cc:
security@k.o as there's nothing the people there can do about it now :)

thanks,

greg k-h