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From: Felix Gu <ustc.gu@gmail.com>
To: Vincent Shih <vincent.sunplus@gmail.com>,
	Vinod Koul <vkoul@kernel.org>,
	 Neil Armstrong <neil.armstrong@linaro.org>
Cc: linux-usb@vger.kernel.org, linux-phy@lists.infradead.org,
	 linux-kernel@vger.kernel.org, Felix Gu <ustc.gu@gmail.com>
Subject: [PATCH v2 1/2] phy: sunplus: fix memory leak in update_disc_vol()
Date: Fri, 07 Aug 2026 21:16:59 +0800	[thread overview]
Message-ID: <20260807-sunplus-v2-1-d5379c664dfc@gmail.com> (raw)
In-Reply-To: <20260807-sunplus-v2-0-d5379c664dfc@gmail.com>

nvmem_cell_read() returns a kmalloc'd buffer that update_disc_vol()
never freed. Free it after extracting the disconnect-voltage value.

Fixes: 99d9ccd97385 ("phy: usb: Add USB2.0 phy driver for Sunplus SP7021")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
---
 drivers/phy/sunplus/phy-sunplus-usb2.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/sunplus/phy-sunplus-usb2.c b/drivers/phy/sunplus/phy-sunplus-usb2.c
index 637a5fbae6d9..842087bdfba5 100644
--- a/drivers/phy/sunplus/phy-sunplus-usb2.c
+++ b/drivers/phy/sunplus/phy-sunplus-usb2.c
@@ -81,7 +81,7 @@ static int update_disc_vol(struct sp_usbphy *usbphy)
 	char *disc_name = "disc_vol";
 	ssize_t otp_l = 0;
 	char *otp_v;
-	u32 val, set;
+	u32 val, set = OTP_DISC_LEVEL_DEFAULT;
 
 	cell = nvmem_cell_get(usbphy->dev, disc_name);
 	if (IS_ERR_OR_NULL(cell)) {
@@ -96,11 +96,11 @@ static int update_disc_vol(struct sp_usbphy *usbphy)
 		set = *(otp_v + 1);
 		set = (set << (sizeof(char) * 8)) | *otp_v;
 		set = (set >> usbphy->disc_vol_addr_off) & J_DISC;
+		if (set == 0)
+			set = OTP_DISC_LEVEL_DEFAULT;
+		kfree(otp_v);
 	}
 
-	if (IS_ERR(otp_v) || set == 0)
-		set = OTP_DISC_LEVEL_DEFAULT;
-
 	val = readl(usbphy->phy_regs + CONFIG7);
 	val = (val & ~J_DISC) | set;
 	writel(val, usbphy->phy_regs + CONFIG7);

-- 
2.43.0


-- 
linux-phy mailing list
linux-phy@lists.infradead.org
https://lists.infradead.org/mailman/listinfo/linux-phy

WARNING: multiple messages have this Message-ID (diff)
From: Felix Gu <ustc.gu@gmail.com>
To: Vincent Shih <vincent.sunplus@gmail.com>,
	Vinod Koul <vkoul@kernel.org>,
	 Neil Armstrong <neil.armstrong@linaro.org>
Cc: linux-usb@vger.kernel.org, linux-phy@lists.infradead.org,
	 linux-kernel@vger.kernel.org, Felix Gu <ustc.gu@gmail.com>
Subject: [PATCH v2 1/2] phy: sunplus: fix memory leak in update_disc_vol()
Date: Fri, 07 Aug 2026 21:16:59 +0800	[thread overview]
Message-ID: <20260807-sunplus-v2-1-d5379c664dfc@gmail.com> (raw)
In-Reply-To: <20260807-sunplus-v2-0-d5379c664dfc@gmail.com>

nvmem_cell_read() returns a kmalloc'd buffer that update_disc_vol()
never freed. Free it after extracting the disconnect-voltage value.

Fixes: 99d9ccd97385 ("phy: usb: Add USB2.0 phy driver for Sunplus SP7021")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
---
 drivers/phy/sunplus/phy-sunplus-usb2.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/sunplus/phy-sunplus-usb2.c b/drivers/phy/sunplus/phy-sunplus-usb2.c
index 637a5fbae6d9..842087bdfba5 100644
--- a/drivers/phy/sunplus/phy-sunplus-usb2.c
+++ b/drivers/phy/sunplus/phy-sunplus-usb2.c
@@ -81,7 +81,7 @@ static int update_disc_vol(struct sp_usbphy *usbphy)
 	char *disc_name = "disc_vol";
 	ssize_t otp_l = 0;
 	char *otp_v;
-	u32 val, set;
+	u32 val, set = OTP_DISC_LEVEL_DEFAULT;
 
 	cell = nvmem_cell_get(usbphy->dev, disc_name);
 	if (IS_ERR_OR_NULL(cell)) {
@@ -96,11 +96,11 @@ static int update_disc_vol(struct sp_usbphy *usbphy)
 		set = *(otp_v + 1);
 		set = (set << (sizeof(char) * 8)) | *otp_v;
 		set = (set >> usbphy->disc_vol_addr_off) & J_DISC;
+		if (set == 0)
+			set = OTP_DISC_LEVEL_DEFAULT;
+		kfree(otp_v);
 	}
 
-	if (IS_ERR(otp_v) || set == 0)
-		set = OTP_DISC_LEVEL_DEFAULT;
-
 	val = readl(usbphy->phy_regs + CONFIG7);
 	val = (val & ~J_DISC) | set;
 	writel(val, usbphy->phy_regs + CONFIG7);

-- 
2.43.0


  reply	other threads:[~2026-08-07 13:17 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-07 13:16 [PATCH v2 0/2] phy: sunplus: fix two issues in update_disc_vol() Felix Gu
2026-08-07 13:16 ` Felix Gu
2026-08-07 13:16 ` Felix Gu [this message]
2026-08-07 13:16   ` [PATCH v2 1/2] phy: sunplus: fix memory leak " Felix Gu
2026-08-07 13:32   ` sashiko-bot
2026-08-07 13:17 ` [PATCH v2 2/2] phy: sunplus: fix ERR_PTR deref " Felix Gu
2026-08-07 13:17   ` Felix Gu
2026-08-07 13:38   ` sashiko-bot

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