i2c: rtl9300: Fix out-of-bounds bug in rtl9300_i2c_smbus_xfer

The data->block[0] variable comes from user. Without proper check,
the variable may be very large to cause an out-of-bounds bug.

Fix this bug by checking the value of data->block[0] first.

1. commit 39244cc ("i2c: ismt: Fix an out-of-bounds bug in
   ismt_access()")
2. commit 92fbb6d ("i2c: xgene-slimpro: Fix out-of-bounds bug in
   xgene_slimpro_i2c_xfer()")

Fixes: c366be7 ("i2c: Add driver for the RTL9300 I2C controller")
Signed-off-by: Alex Guo <[email protected]>
Cc: <[email protected]> # v6.13+
Reviewed-by: Chris Packham <[email protected]>
Tested-by: Chris Packham <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Signed-off-by: Sven Eckelmann <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: mugitya03

drivers/i2c/busses/i2c-rtl9300.c

@@ -281,6 +281,10 @@ static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned s
 		ret = rtl9300_i2c_reg_addr_set(i2c, command, 1);
 		if (ret)
 			goto out_unlock;
+		if (data->block[0] < 1 || data->block[0] > I2C_SMBUS_BLOCK_MAX) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
 		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, data->block[0]);
 		if (ret)
 			goto out_unlock;