linux-kernel - [PATCH] media: m88rs6000t: avoid potential out-of-bounds reads on arrays

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Message-Id: <20201007121628.20676-1-colin.king@canonical.com>
Date:   Wed,  7 Oct 2020 13:16:28 +0100
From:   Colin King <colin.king@...onical.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        "nibble . max" <nibble.max@...il.com>, linux-media@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: m88rs6000t: avoid potential out-of-bounds reads on arrays

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

There a 3 array for-loops that don't check the upper bounds of the
index into arrays and this may lead to potential out-of-bounds
reads.  Fix this by adding array size upper bounds checks to be
full safe.

Addresses-Coverity: ("Out-of-bounds read")
Fixes: 333829110f1d ("[media] m88rs6000t: add new dvb-s/s2 tuner for integrated chip M88RS6000")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/media/tuners/m88rs6000t.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/tuners/m88rs6000t.c b/drivers/media/tuners/m88rs6000t.c
index b3505f402476..8647c50b66e5 100644
--- a/drivers/media/tuners/m88rs6000t.c
+++ b/drivers/media/tuners/m88rs6000t.c
@@ -525,7 +525,7 @@ static int m88rs6000t_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 	PGA2_cri = PGA2_GC >> 2;
 	PGA2_crf = PGA2_GC & 0x03;
 
-	for (i = 0; i <= RF_GC; i++)
+	for (i = 0; i <= RF_GC && i < ARRAY_SIZE(RFGS); i++)
 		RFG += RFGS[i];
 
 	if (RF_GC == 0)
@@ -537,12 +537,12 @@ static int m88rs6000t_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 	if (RF_GC == 3)
 		RFG += 100;
 
-	for (i = 0; i <= IF_GC; i++)
+	for (i = 0; i <= IF_GC && i < ARRAY_SIZE(IFGS); i++)
 		IFG += IFGS[i];
 
 	TIAG = TIA_GC * TIA_GS;
 
-	for (i = 0; i <= BB_GC; i++)
+	for (i = 0; i <= BB_GC && i < ARRAY_SIZE(BBGS); i++)
 		BBG += BBGS[i];
 
 	PGA2G = PGA2_cri * PGA2_cri_GS + PGA2_crf * PGA2_crf_GS;
-- 
2.27.0