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

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Message-Id: <20200114145448.361888-1-colin.king@canonical.com>
Date:   Tue, 14 Jan 2020 14:54:48 +0000
From:   Colin King <colin.king@...onical.com>
To:     Zhao Qiang <qiang.zhao@....com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net/wan/fsl_ucc_hdlc: fix out of bounds write on array utdm_info

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>
---
 drivers/net/wan/fsl_ucc_hdlc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 94e870f48e21..9edd94679283 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -73,7 +73,7 @@ static struct ucc_tdm_info utdm_primary_info = {
 	},
 };
 
-static struct ucc_tdm_info utdm_info[MAX_HDLC_NUM];
+static struct ucc_tdm_info utdm_info[UCC_MAX_NUM];
 
 static int uhdlc_init(struct ucc_hdlc_private *priv)
 {
-- 
2.24.0