Messages in this thread | | | Subject | Re: [PATCH] netfilter: nf_ct_helper: Fix possible panic when nf_conntrack_helper_unregister is used in an unloadable module | From | Sergei Shtylyov <> | Date | Fri, 1 Mar 2019 11:43:43 +0300 |
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Hello!
On 01.03.2019 8:56, Su Yanjun wrote:
> From: Su Yanjun <suyj.fnst@cn.fujitsu.com> > > Because nf_conntrack_helper_unregister maybe used in an unloadable module, > it uses 'synchronize_rcu' which may cause kernel panic. > > According to the artical:
Article?
> RCU and Unloadable Modules > https://lwn.net/Articles/217484/ > > When we have a heavy rcu callback load, then some of the callbacks might be > deferred in order to allow other processing to proceed. sychnorize_rcu does > not wait rcu callback complete and module may be unloaded before callback > done. > > This patch uses rcu_barrier instead of synchronize_rcu will prevent this ^ that/which missed?
> situation. > > Signed-off-by: Su Yanjun <suyj.fnst@cn.fujitsu.com> [...]
MBR, Sergei
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