linux-kernel - Re: [PATCH] staging: rtl8192u: change get_key functions to return 0 instead of -1

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Date:   Wed, 20 Apr 2022 20:52:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Rebecca Mckeever <remckee0@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        outreachy@...ts.linux.dev
Subject: Re: [PATCH] staging: rtl8192u: change get_key functions to return 0
 instead of -1

On Wed, Apr 20, 2022 at 07:23:28AM -0500, Rebecca Mckeever wrote:
> Currently, these three get_key functions return -1 when the provided len
> value is less a specific key length value, which can result in buffer
> overflow depending on how the returned value is used. These functions are
> used in three places in ieee80211/ieee80211_wx.c:
> 
>   ieee80211_wx_get_encode() :
>     The behavior of this function will be unchanged.
> 
>   ieee80211_wx_get_encode_ext() :
>     The result of the get_key function is written to ext->key_len,
>     resulting in a buffer overflow if the result is negative.
> 
>   ieee80211_wx_set_encode() :
>     The behavior of this function will change. When len is less than the
>     key length value, it will set a default key of all 0.
> 
> Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Rebecca Mckeever <remckee0@...il.com>

Of course I suggested this one, but reviewing it again it still seems
like the right thing.  Good commit message.  It explains the
controversial bit nicely which is the behavior change in
ieee80211_wx_set_encode().  When you explain the all controversial bits
in advance then it builds trust.

regards,
dan carpenter