linux-kernel - Re: [PATCH net v2] ipmr: Fix access to mfc_cache

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Message-ID: <20241113191023.401fad6b@kernel.org>
Date: Wed, 13 Nov 2024 19:10:23 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: "David S. Miller" <davem@...emloft.net>, David Ahern
 <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, David Ahern
 <dsahern@...il.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 kernel-team@...a.com
Subject: Re: [PATCH net v2] ipmr: Fix access to mfc_cache_list without lock
 held

On Fri, 08 Nov 2024 06:08:36 -0800 Breno Leitao wrote:
> Accessing `mr_table->mfc_cache_list` is protected by an RCU lock. In the
> following code flow, the RCU read lock is not held, causing the
> following error when `RCU_PROVE` is not held. The same problem might
> show up in the IPv6 code path.

good start, I hope someone can fix the gazillion warnings the CI 
is hitting on the table accesses :)