[PATCH] ray_cs: fix array out-of-bounds access

From: Colin King <colin.king@canonical.com>
To: Kalle Valo <kvalo@codeaurora.org>,
	"David S . Miller" <davem@davemloft.net>,
	linux-wireless@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH] ray_cs: fix array out-of-bounds access
Date: Thu, 20 Dec 2018 14:05:50 +0000	[thread overview]
Message-ID: <20181220140550.18853-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

Currently array element org[3] is being accessed, however the array is
only 3 elements in size, so this looks like an off-by-one out-of-bounds
error. Fix this by using org[2], which I believe was the original
intent.

This issue has existed in the driver back in the pre-git days, so no
idea when it was introduced.

Detected by CoverityScan, CID#711344 ("Out-of-bounds read")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/wireless/ray_cs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ray_cs.c b/drivers/net/wireless/ray_cs.c
index 33ad87528d9a..8b2741c8edf2 100644
--- a/drivers/net/wireless/ray_cs.c
+++ b/drivers/net/wireless/ray_cs.c
@@ -959,7 +959,7 @@ static int translate_frame(ray_dev_t *local, struct tx_msg __iomem *ptx,
 		if (proto == htons(ETH_P_AARP) || proto == htons(ETH_P_IPX)) {
 			/* This is the selective translation table, only 2 entries */
 			writeb(0xf8,
-			       &((struct snaphdr_t __iomem *)ptx->var)->org[3]);
+			       &((struct snaphdr_t __iomem *)ptx->var)->org[2]);
 		}
 		/* Copy body of ethernet packet without ethernet header */
 		memcpy_toio((void __iomem *)&ptx->var +
-- 
2.19.1

