linux-kernel - Re: [PATCH] net/wan/fsl_ucc_hdlc: fix out of bounds write on array utdm

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Date:   Wed, 15 Jan 2020 14:06:40 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     qiang.zhao@....com, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/wan/fsl_ucc_hdlc: fix out of bounds write on array
 utdm_info

From: Colin King <colin.king@...onical.com>
Date: Tue, 14 Jan 2020 14:54:48 +0000

> From: Colin Ian King <colin.king@...onical.com>
> 
> Array utdm_info is declared as an array of MAX_HDLC_NUM (4) elements
> however up to UCC_MAX_NUM (8) elements are potentially being written
> to it.  Currently we have an array out-of-bounds write error on the
> last 4 elements. Fix this by making utdm_info UCC_MAX_NUM elements in
> size.
> 
> Addresses-Coverity: ("Out-of-bounds write")
> Fixes: c19b6d246a35 ("drivers/net: support hdlc function for QE-UCC")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied and queued up for -stable.