net: fix possible store tearing in neigh_periodic_work()

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[ Upstream commit 25563b581b ]

While looking at a related syzbot report involving neigh_periodic_work(),
I found that I forgot to add an annotation when deleting an
RCU protected item from a list.

Readers use rcu_deference(*np), we need to use either
rcu_assign_pointer() or WRITE_ONCE() on writer side
to prevent store tearing.

I use rcu_assign_pointer() to have lockdep support,
this was the choice made in neigh_flush_dev().

Fixes: 767e97e1e0 ("neigh: RCU conversion of struct neighbour")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Eric Dumazet 2023-09-21 08:46:26 +00:00 • committed by Greg Kroah-Hartman

parent bdb4fcf18e

commit 147d89ee41

1 changed files with 3 additions and 1 deletions

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net/core/neighbour.c

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