From: Asmaa Mnebhi asmaa@nvidia.com

stable inclusion from stable-v5.10.146 commit 48ee0a864d1af02eea98fc825cc230d61517a71e category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0VX CVE: CVE-2022-48632

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ 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 Signed-off-by: Jialin Zhang zhangjialin11@huawei.com Reviewed-by: Zheng Zengkai zhengzengkai@huawei.com Signed-off-by: Liu Shixin liushixin2@huawei.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 ab261d762dea..833c5ede863b 100644 --- a/drivers/i2c/busses/i2c-mlxbf.c +++ b/drivers/i2c/busses/i2c-mlxbf.c @@ -744,6 +744,9 @@ 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;