linux-kernel - [PATCH v1 5/7] i2c-mlxbf: prevent stack overflow in mlxbf_i2c_smbus_start

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Message-Id: <20220816225412.9095-6-asmaa@nvidia.com>
Date:   Tue, 16 Aug 2022 18:54:10 -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>,
        Khalil Blaiech <kblaiech@...dia.com>
Subject: [PATCH v1 5/7] 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.

Reviewed-by: Khalil Blaiech <kblaiech@...dia.com>
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 02ed6983c35c..c6959ba7113e 100644
--- a/drivers/i2c/busses/i2c-mlxbf.c
+++ b/drivers/i2c/busses/i2c-mlxbf.c
@@ -724,6 +724,9 @@ 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