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Date: Fri, 21 Jan 2022 08:13:11 -0800 From: Stephen Hemminger <stephen@...workplumber.org> To: ycaibb <ycaibb@...il.com> Cc: davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] net: missing lock releases in ipmr_base.c On Fri, 21 Jan 2022 11:22:10 +0800 ycaibb <ycaibb@...il.com> wrote: > From: Ryan Cai <ycaibb@...il.com> > > In method mr_mfc_seq_idx, the lock it->lock and rcu_read_lock are not released when pos-- == 0 is true. > > Signed-off-by: Ryan Cai <ycaibb@...il.com> > --- > net/ipv4/ipmr_base.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/net/ipv4/ipmr_base.c b/net/ipv4/ipmr_base.c > index aa8738a91210..c4a247024c85 100644 > --- a/net/ipv4/ipmr_base.c > +++ b/net/ipv4/ipmr_base.c > @@ -154,6 +154,7 @@ void *mr_mfc_seq_idx(struct net *net, > it->cache = &mrt->mfc_cache_list; > list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) > if (pos-- == 0) > + rcu_read_unlock(); > return mfc; > rcu_read_unlock(); > > @@ -161,6 +162,7 @@ void *mr_mfc_seq_idx(struct net *net, > it->cache = &mrt->mfc_unres_queue; > list_for_each_entry(mfc, it->cache, list) > if (pos-- == 0) > + spin_unlock_bh(it->lock); > return mfc; > spin_unlock_bh(it->lock); > Another buggy patch, perhaps you write python or research papers?
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