linux-kernel - out of bounds read in drivers/net/wireless/ray

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Date:   Thu, 20 Dec 2018 13:06:58 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        netdev@...r.kernel.org
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: out of bounds read in drivers/net/wireless/ray_cs.c

Static analysis with CoverityScan picked up an out of bounds read issue
that has been in the Raylink wireless LAN card driver since it appeared
in the kernel:

drivers/net/wireless/ray_cs.c:

accessing org[3] is out of bounds, the array has just 3 elements.

 959                if (proto == htons(ETH_P_AARP) || proto ==
htons(ETH_P_IPX)) {
 960                        /* This is the selective translation table,
only 2 entries */

    CID undefined (#1 of 1): Out-of-bounds read
    overrun-local: Overrunning array of 3 bytes at byte offset 3 by
dereferencing pointer &((struct snaphdr_t *)ptx->var)->org[3].

 961                        writeb(0xf8,
 962                               &((struct snaphdr_t __iomem
*)ptx->var)->org[3]);
 963                }

I suspect the org[3] is a typo and should be org[2], but I don't have
any info on the H/W so I'm speculating that this is the issue. Any ideas
anyone?

Colin