1 files changed, 47 insertions, 0 deletions
diff --git a/queue-5.4/i2c-tiny-usb-disable-zero-length-read-messages.patch b/queue-5.4/i2c-tiny-usb-disable-zero-length-read-messages.patch
new file mode 100644
index 0000000000..d959364d43
--- /dev/null
+++ b/queue-5.4/i2c-tiny-usb-disable-zero-length-read-messages.patch
@@ -0,0 +1,47 @@
+From cbdb25ccf7566eee0c2b945e35cb98baf9ed0aa6 Mon Sep 17 00:00:00 2001
+From: Wolfram Sang <wsa+renesas@sang-engineering.com>
+Date: Thu, 22 May 2025 08:43:49 +0200
+Subject: i2c: tiny-usb: disable zero-length read messages
+
+From: Wolfram Sang <wsa+renesas@sang-engineering.com>
+
+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: e8c76eed2ecd ("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>
+---
+ drivers/i2c/busses/i2c-tiny-usb.c |    6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/drivers/i2c/busses/i2c-tiny-usb.c
++++ b/drivers/i2c/busses/i2c-tiny-usb.c
+@@ -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
+ 	/* 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),