netfilter: nf_conncount: move all list iterations under spinlock

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Two CPUs may race to remove a connection from the list, the existing
conn->dead will result in a use-after-free. Use the per-list spinlock to
protect list iterations.

As all accesses to the list now happen while holding the per-list lock,
we no longer need to delay free operations with rcu.

Joint work with Florian.

Fixes: 5c789e131c ("netfilter: nf_conncount: Add list lock and gc worker, and RCU for init tree search")
Reviewed-by: Shawn Bohrer <sbohrer@cloudflare.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Pablo Neira Ayuso 2018-12-28 01:24:47 +01:00

parent df4a902509

commit 2f971a8f42

1 changed files with 20 additions and 26 deletions

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net/netfilter/nf_conncount.c

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