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i2c: tiny-usb: disable zero-length read messages

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commit cbdb25ccf7566eee0c2b945e35cb98baf9ed0aa6 upstream.

This driver passes the length of an i2c_msg directly to
usb_control_msg(). If the message is now a read and of length 0, it
violates the USB protocol and a warning will be printed. Enable the
I2C_AQ_NO_ZERO_LEN_READ quirk for this adapter thus forbidding 0-length
read messages altogether.

Fixes: e8c76eed2e ("i2c: New i2c-tiny-usb bus driver")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: <stable@vger.kernel.org> # v2.6.22+
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250522064349.3823-2-wsa+renesas@sang-engineering.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wolfram Sang 2025-05-22 08:43:49 +02:00 • committed by Greg Kroah-Hartman
commit e34167aee4
1 changed files with 6 additions and 0 deletions
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6
drivers/i2c/busses/i2c-tiny-usb.c
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@ -140,6 +140,11 @@ out:
return ret;
}
/* prevent invalid 0-length usb_control_msg */
static const struct i2c_adapter_quirks usb_quirks = {
.flags = I2C_AQ_NO_ZERO_LEN_READ,
};
/* This is the actual algorithm we define */
static const struct i2c_algorithm usb_algorithm = {
.master_xfer = usb_xfer,
@ -246,6 +251,7 @@ static int i2c_tiny_usb_probe(struct usb_interface *interface,
/* setup i2c adapter description */
dev->adapter.owner = THIS_MODULE;
dev->adapter.class = I2C_CLASS_HWMON;
dev->adapter.quirks = &usb_quirks;
dev->adapter.algo = &usb_algorithm;
dev->adapter.algo_data = dev;
snprintf(dev->adapter.name, sizeof(dev->adapter.name),