Patch "i2c: mark HostNotify target address as used" has been added to the 6.9-stable tree

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This is a note to let you know that I've just added the patch titled

    i2c: mark HostNotify target address as used

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i2c-mark-hostnotify-target-address-as-used.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit cf61b5097ae6176834ef5936a221a812d1c5f6de
Author: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Date:   Wed Jul 10 10:55:07 2024 +0200

    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 <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index db0d1ac82910e..7e7b15440832b 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1067,6 +1067,7 @@ EXPORT_SYMBOL(i2c_find_device_by_fwnode);
 
 static const struct i2c_device_id dummy_id[] = {
 	{ "dummy", 0 },
+	{ "smbus_host_notify", 0 },
 	{ },
 };
 




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