linux-kernel - [PATCH] i2c: rtl9300: Fix out-of-bounds bug in rtl9300_i2c_smbus

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Message-Id: <20250615235248.529019-1-alexguo1023@gmail.com>
Date: Sun, 15 Jun 2025 19:52:48 -0400
From: Alex Guo <alexguo1023@...il.com>
To: chris.packham@...iedtelesis.co.nz
Cc: alexguo1023@...il.com,
	andi.shyti@...nel.org,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: rtl9300: Fix out-of-bounds bug in rtl9300_i2c_smbus_xfer

The data->block[0] variable comes from user. Without proper check,
the variable may be very large to cause an out-of-bounds bug.

Fix this bug by checking the value of data->block[0] first.

Similar commit:
1. commit 39244cc7548 ("i2c: ismt: Fix an out-of-bounds bug in
ismt_access()")
2. commit 92fbb6d1296 ("i2c: xgene-slimpro: Fix out-of-bounds
bug in xgene_slimpro_i2c_xfer()")

Signed-off-by: Alex Guo <alexguo1023@...il.com>
---
 drivers/i2c/busses/i2c-rtl9300.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/i2c/busses/i2c-rtl9300.c b/drivers/i2c/busses/i2c-rtl9300.c
index e064e8a4a1f0..568495720810 100644
--- a/drivers/i2c/busses/i2c-rtl9300.c
+++ b/drivers/i2c/busses/i2c-rtl9300.c
@@ -281,6 +281,10 @@ static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned s
 		ret = rtl9300_i2c_reg_addr_set(i2c, command, 1);
 		if (ret)
 			goto out_unlock;
+		if (data->block[0] < 1 || data->block[0] > I2C_SMBUS_BLOCK_MAX) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
 		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, data->block[0]);
 		if (ret)
 			goto out_unlock;
-- 
2.34.1