diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2022-06-02 14:02:18 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-06-02 08:40:56 -0700 |
| commit | 690b2549b19563ec5ad53e5c82f6a944d910086e (patch) | |
| tree | 59d93f4cfe6a688fbf9455c88ad2ec776955c90b /drivers/i2c | |
| parent | d1dc87763f406d4e67caf16dbe438a5647692395 (diff) | |
i2c: ismt: prevent memory corruption in ismt_access()
The "data->block[0]" variable comes from the user and is a number
between 0-255. It needs to be capped to prevent writing beyond the end
of dma_buffer[].
Fixes: 5e9a97b1f449 ("i2c: ismt: Adding support for I2C_SMBUS_BLOCK_PROC_CALL")
Reported-and-tested-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ismt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c index c16157ee8c52..6078fa0c0d48 100644 --- a/drivers/i2c/busses/i2c-ismt.c +++ b/drivers/i2c/busses/i2c-ismt.c @@ -528,6 +528,9 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, case I2C_SMBUS_BLOCK_PROC_CALL: dev_dbg(dev, "I2C_SMBUS_BLOCK_PROC_CALL\n"); + if (data->block[0] > I2C_SMBUS_BLOCK_MAX) + return -EINVAL; + dma_size = I2C_SMBUS_BLOCK_MAX; desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, 1); desc->wr_len_cmd = data->block[0] + 1; |