[patch 38/60] i2c: Fix NULL pointer dereference ini2c_new_probed_device

[Greg KH]

2.6.26-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Hans Verkuil <hverkuil@xxxxxxxxx>

Already in Linus' tree:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b25b791b13aaa336b56c4f9bd417ff126363f80b

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@xxxxxxxxx>
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/i2c/i2c-core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1196,9 +1196,11 @@ i2c_new_probed_device(struct i2c_adapter
 		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,

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