tree eb2743c8cd3dfe4eab6d127bc1951e7b552cc259
parent b9940f38dafe9690167eb49d10800bb9a55c1367
author Lion Ackermann <nnamrec@gmail.com> 1733156577 +0100
committer Shuo Yang <gshuoy@google.com> 1735946624 -0800

net: sched: fix ordering of qlen adjustment

commit 5eb7de8cd58e73851cd37ff8d0666517d9926948 upstream.

Changes to sch->q.qlen around qdisc_tree_reduce_backlog() need to happen
_before_ a call to said function because otherwise it may fail to notify
parent qdiscs when the child is about to become empty.

BUG=b/385096878
TEST=presubmit
RELEASE_NOTE=Fixed KCTF-5eb7de8 in the Linux kernel.

cos-patch: security-high
Change-Id: Id628c7ca647b43a5f5b1e004aef434a64001e2b8
Signed-off-by: Lion Ackermann <nnamrec@gmail.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Artem Metla <ametla@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kernel CVE Triage Automation <cloud-image-kernel-cve-triage-automation@prod.google.com>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/89379
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Shuo Yang <gshuoy@google.com>
Reviewed-by: He Gao <hegao@google.com>