linux-kernel - [PATCH 4.4 073/112] memory: omap-gpmc: Fix a couple off by ones

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Message-Id: <20201027134904.005456129@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:49:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Roger Quadros <rogerq@...com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 073/112] memory: omap-gpmc: Fix a couple off by ones

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 4c54228ac8fd55044195825873c50a524131fa53 ]

These comparisons should be >= instead of > to prevent reading one
element beyond the end of the gpmc_cs[] array.

Fixes: cdd6928c589a ("ARM: OMAP2+: Add device-tree support for NOR flash")
Fixes: f37e4580c409 ("ARM: OMAP2: Dynamic allocator for GPMC memory space")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Roger Quadros <rogerq@...com>
Link: https://lore.kernel.org/r/20200825104707.GB278587@mwanda
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/memory/omap-gpmc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 49691a8c74ee9..af187c91fc33b 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -928,7 +928,7 @@ static int gpmc_cs_remap(int cs, u32 base)
 	int ret;
 	u32 old_base, size;
 
-	if (cs > gpmc_cs_num) {
+	if (cs >= gpmc_cs_num) {
 		pr_err("%s: requested chip-select is disabled\n", __func__);
 		return -ENODEV;
 	}
@@ -963,7 +963,7 @@ int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
 	struct resource *res = &gpmc->mem;
 	int r = -1;
 
-	if (cs > gpmc_cs_num) {
+	if (cs >= gpmc_cs_num) {
 		pr_err("%s: requested chip-select is disabled\n", __func__);
 		return -ENODEV;
 	}
-- 
2.25.1