Re: [PATCH] bus: fsl-mc: fix use-after-free in driver_override_show()

On Wed, Dec 03, 2025 at 01:44:38AM +0800, Gui-Dong Han wrote:

The driver_override_show() function reads the driver_override string without holding the device_lock. However, driver_override_store() uses driver_set_override(), which modifies and frees the string while holding the device_lock.

This can result in a concurrent use-after-free if the string is freed by the store function while being read by the show function.

Fix this by holding the device_lock around the read operation.

Fixes: 1f86a00c1159 ("bus/fsl-mc: add support for 'driver_override' in the mc-bus") Cc: stable@vger.kernel.org Signed-off-by: Gui-Dong Han hanguidong02@gmail.com

Reviewed-by: Ioana Ciornei ioana.ciornei@nxp.com

Thanks!