linux-kernel - [PATCH v2 4/9] i2c-mlxbf: prevent stack overflow in mlxbf_i2c_smbus_start

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Date:   Mon, 22 Aug 2022 15:57:20 -0400
From:   Asmaa Mnebhi <asmaa@...dia.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Asmaa Mnebhi <asmaa@...dia.com>
Subject: [PATCH v2 4/9] i2c-mlxbf: prevent stack overflow in mlxbf_i2c_smbus_start_transaction()

memcpy() is called in a loop while 'operation->length' upper bound
is not checked and 'data_idx' also increments.

Fixes: b5b5b32081cd206b ("i2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC")
Signed-off-by: Asmaa Mnebhi <asmaa@...dia.com>
---
 drivers/i2c/busses/i2c-mlxbf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-mlxbf.c b/drivers/i2c/busses/i2c-mlxbf.c
index da0bdbd66e2e..a8c5fef3f1cd 100644
--- a/drivers/i2c/busses/i2c-mlxbf.c
+++ b/drivers/i2c/busses/i2c-mlxbf.c
@@ -731,6 +731,9 @@ mlxbf_i2c_smbus_start_transaction(struct mlxbf_i2c_priv *priv,
 		if (flags & MLXBF_I2C_F_WRITE) {
 			write_en = 1;
 			write_len += operation->length;
+			if (data_idx + operation->length >
+					MLXBF_I2C_MASTER_DATA_DESC_SIZE)
+				return -ENOBUFS;
 			memcpy(data_desc + data_idx,
 			       operation->buffer, operation->length);
 			data_idx += operation->length;
-- 
2.30.1