From 2f6cb9525e62f2298dc93a2c01243204dcdcacfb Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Wed, 10 Jul 2024 10:55:07 +0200 Subject: [PATCH] i2c: mark HostNotify target address as used [ Upstream commit bd9f5348089b65612e5ca976e2ae22f005340331 ] I2C core handles the local target for receiving HostNotify alerts. There is no separate driver bound to that address. That means userspace can access it if desired, leading to further complications if controllers are not capable of reading their own local target. Bind the local target to the dummy driver so it will be marked as "handled by the kernel" if the HostNotify feature is used. That protects aginst userspace access and prevents other drivers binding to it. Fixes: 2a71593da34d ("i2c: smbus: add core function handling SMBus host-notify") Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/i2c-core-base.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index e8a89e18c..6fac638e4 100755 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -969,6 +969,7 @@ EXPORT_SYMBOL_GPL(i2c_unregister_device); static const struct i2c_device_id dummy_id[] = { { "dummy", 0 }, + { "smbus_host_notify", 0 }, { }, };