This is already fixed in master by 280e9191cbf8a766e69ab138450f2beccbedd879.
This can happen in the error codepath in non_widelink_open().
Got a customer report with a crash caused by this, so we need to backport 280e9191cbf8a766e69ab138450f2beccbedd879.
Created attachment 17387 [details]
Patch for 4.15 and 4.16 cherry-picked from master
Ping, can we get this one in please ? Flag me to review if needed :-).
Re-assigning to Jule for inclusion in 4.16.next, 4.15.next.