linux-kernel - [PATCH v2 1/2] phy: marvell: a3700-comphy: Fix out of bounds read

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Date: Mon, 25 Mar 2024 23:12:49 +0300
From: Mikhail Kobuk <m.kobuk@...ras.ru>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Mikhail Kobuk <m.kobuk@...ras.ru>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Pali Rohár <pali@...nel.org>,
	Marek Behún <kabel@...nel.org>,
	linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	Alexey Khoroshilov <khoroshilov@...ras.ru>
Subject: [PATCH v2 1/2] phy: marvell: a3700-comphy: Fix out of bounds read

There is an out of bounds read access of 'gbe_phy_init_fix[fix_idx].addr'
every iteration after 'fix_idx' reaches 'ARRAY_SIZE(gbe_phy_init_fix)'.

Make sure 'gbe_phy_init[addr]' is used when all elements of
'gbe_phy_init_fix' array are handled.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 934337080c6c ("phy: marvell: phy-mvebu-a3700-comphy: Add native kernel implementation")
Signed-off-by: Mikhail Kobuk <m.kobuk@...ras.ru>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/phy/marvell/phy-mvebu-a3700-comphy.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/marvell/phy-mvebu-a3700-comphy.c b/drivers/phy/marvell/phy-mvebu-a3700-comphy.c
index 41162d7228c9..68710ad1ad70 100644
--- a/drivers/phy/marvell/phy-mvebu-a3700-comphy.c
+++ b/drivers/phy/marvell/phy-mvebu-a3700-comphy.c
@@ -611,11 +611,12 @@ static void comphy_gbe_phy_init(struct mvebu_a3700_comphy_lane *lane,
 		 * comparison to 3.125 Gbps values. These register values are
 		 * stored in "gbe_phy_init_fix" array.
 		 */
-		if (!is_1gbps && gbe_phy_init_fix[fix_idx].addr == addr) {
+		if (!is_1gbps &&
+		    fix_idx < ARRAY_SIZE(gbe_phy_init_fix) &&
+		    gbe_phy_init_fix[fix_idx].addr == addr) {
 			/* Use new value */
 			val = gbe_phy_init_fix[fix_idx].value;
-			if (fix_idx < ARRAY_SIZE(gbe_phy_init_fix))
-				fix_idx++;
+			fix_idx++;
 		} else {
 			val = gbe_phy_init[addr];
 		}
-- 
2.44.0