CVE-2025-37992

In the Linux kernel, the following vulnerability has been resolved:

netsched: Flush gsoskb list too during ->change()

Previously, when reducing a qdisc's limit via the ->change() operation, only the main skb queue was trimmed, potentially leaving packets in the gso_skb list. This could result in NULL pointer dereference when we only check sch->limit against sch->q.qlen.

This patch introduces a new helper, qdiscdequeueinternal(), which ensures both the gsoskb list and the main queue are properly flushed when trimming excess packets. All relevant qdiscs (codel, fq, fqcodel, fq_pie, hhf, pie) are updated to use this helper in their ->change() routines.