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Subject[PATCH 5.15 138/148] i2c: mlxbf: prevent stack overflow in mlxbf_i2c_smbus_start_transaction()
Date
From: Asmaa Mnebhi <asmaa@nvidia.com>

[ Upstream commit de24aceb07d426b6f1c59f33889d6a964770547b ]

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")
Reviewed-by: Khalil Blaiech <kblaiech@nvidia.com>
Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 612736906440..ac93c0ccf53c 100644
--- a/drivers/i2c/busses/i2c-mlxbf.c
+++ b/drivers/i2c/busses/i2c-mlxbf.c
@@ -738,6 +738,9 @@ 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;
--
2.35.1


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