[PATCH v1 5/7] i2c-mlxbf: prevent stack overflow in mlxbf_i2c_smbus_start_transaction()

[Asmaa Mnebhi]

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

Reviewed-by: Khalil Blaiech <kblaiech@xxxxxxxxxx>
Signed-off-by: Asmaa Mnebhi <asmaa@xxxxxxxxxx>
---
 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