netdev - [net v2 0/2] Fix rcu_read_lock issues in netdev-genl

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Message-Id: <20241113021755.11125-1-jdamato@fastly.com>
Date: Wed, 13 Nov 2024 02:17:50 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: pabeni@...hat.com,
	edumazet@...gle.com,
	amritha.nambiar@...el.com,
	sridhar.samudrala@...el.com,
	kuba@...nel.org,
	mkarsten@...terloo.ca,
	Joe Damato <jdamato@...tly.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org (open list),
	Mina Almasry <almasrymina@...gle.com>,
	Simon Horman <horms@...nel.org>
Subject: [net v2 0/2] Fix rcu_read_lock issues in netdev-genl

Greetings:

Paolo reported a splat [1] when running the new selftest for busy poll.
I confirmed and reproduced this splat locally.

This series proposes 2 patches:
  - Patch 1:
    - Fixes a similar issue in an older commit and CCs stable as this
      fix could be backported.
  - Patch 2:
    - Fixes the issue Paolo hit while running the selftest

I retested locally after applying this series and confirmed that the
splat is fixed.

Thanks,
Joe

[1]: https://lore.kernel.org/netdev/719083c2-e277-447b-b6ea-ca3acb293a03@redhat.com/

v2:
  - Removed the helper and simplified to just add a rcu_read_lock /
    unlock in both patches instead.

rfc: https://lore.kernel.org/lkml/20241112181401.9689-1-jdamato@fastly.com/

Joe Damato (2):
  netdev-genl: Hold rcu_read_lock in napi_get
  netdev-genl: Hold rcu_read_lock in napi_set

 net/core/netdev-genl.c | 4 ++++
 1 file changed, 4 insertions(+)


base-commit: a58f00ed24b849d449f7134fd5d86f07090fe2f5
-- 
2.25.1