i2c: Fix NULL pointer dereference in i2c_new_probed_device

Fix a NULL pointer dereference that happened when calling
i2c_new_probed_device on one of the addresses for which we use byte
reads instead of quick write for detection purpose (that is: 0x30-0x37
and 0x50-0x5f).

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7bf38c418086e45aee6f7d6ba47f256eb65e47f6..c16dcad94412c438998ad9e2014061a7546931cb 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1451,9 +1451,11 @@ i2c_new_probed_device(struct i2c_adapter *adap,
                if ((addr_list[i] & ~0x07) == 0x30
                 || (addr_list[i] & ~0x0f) == 0x50
                 || !i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK)) {
+                       union i2c_smbus_data data;
+
                        if (i2c_smbus_xfer(adap, addr_list[i], 0,
                                           I2C_SMBUS_READ, 0,
-                                          I2C_SMBUS_BYTE, NULL) >= 0)
+                                          I2C_SMBUS_BYTE, &data) >= 0)
                                break;
                } else {
                        if (i2c_smbus_xfer(adap, addr_list[i], 0,