linux-kernel - [PATCH] phy: stm32-usphyc: Fix off by one in probe()

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Message-ID: <aTfHcMJK1wFVnvEe@stanley.mountain>
Date: Tue, 9 Dec 2025 09:53:36 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Amelie Delaunay <amelie.delaunay@...com>
Cc: Vinod Koul <vkoul@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Johan Hovold <johan+linaro@...nel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	linux-phy@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] phy: stm32-usphyc: Fix off by one in probe()

The "index" variable is used as an index into the usbphyc->phys[] array
which has usbphyc->nphys elements.  So if it is equal to usbphyc->nphys
then it is one element out of bounds.  The "index" comes from the
device tree so it's data that we trust and it's unlikely to be wrong,
however it's obviously still worth fixing the bug.  Change the > to >=.

Fixes: 94c358da3a05 ("phy: stm32: add support for STM32 USB PHY Controller (USBPHYC)")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/phy/st/phy-stm32-usbphyc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/st/phy-stm32-usbphyc.c b/drivers/phy/st/phy-stm32-usbphyc.c
index 27fe92f73f33..b44afbff8616 100644
--- a/drivers/phy/st/phy-stm32-usbphyc.c
+++ b/drivers/phy/st/phy-stm32-usbphyc.c
@@ -712,7 +712,7 @@ static int stm32_usbphyc_probe(struct platform_device *pdev)
 		}
 
 		ret = of_property_read_u32(child, "reg", &index);
-		if (ret || index > usbphyc->nphys) {
+		if (ret || index >= usbphyc->nphys) {
 			dev_err(&phy->dev, "invalid reg property: %d\n", ret);
 			if (!ret)
 				ret = -EINVAL;
-- 
2.51.0