[PATCH] firmware: arm_scmi: Fix NULL dereference on notify error path

[Dan Carpenter]

On Thu, Mar 05, 2026 at 01:10:11PM +0000, Cristian Marussi wrote:
> Since commit b5daf93b809d1 ("firmware: arm_scmi: Avoid notifier
> registration for unsupported events") the call chains leading to the helper
> __scmi_event_handler_get_ops expect an ERR_PTR to be returned on failure to
> get an handler for the requested event key, while the current helper can
> still return a NULL when no handler could be found or created.
> 
> Fix by forcing an ERR_PTR return value when the handler reference is NULL.
> 
> Fixes: b5daf93b809d1 ("firmware: arm_scmi: Avoid notifier registration for unsupported events")
> Signed-off-by: Cristian Marussi <cristian.marussi at arm.com>
> ---

Reviewed-by: Dan Carpenter <dan.carpenter at linaro.org>

I feel a bit bad about this.  I saw this as a Smatch warning last August
but I somehow marked it as a false positive.  :/

regards,
dan carpenter