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Message-ID: <20190429155227.etjcgwss6vqgutss@kafai-mbp.dhcp.thefacebook.com> Date: Mon, 29 Apr 2019 15:52:29 +0000 From: Martin Lau <kafai@...com> To: Eric Dumazet <edumazet@...gle.com> CC: "David S . Miller" <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com>, syzbot <syzkaller@...glegroups.com>, David Ahern <dsahern@...il.com> Subject: Re: [PATCH net] ipv6: fix races in ip6_dst_destroy() On Sun, Apr 28, 2019 at 12:22:25PM -0700, Eric Dumazet wrote: > We had many syzbot reports that seem to be caused by use-after-free > of struct fib6_info. > > ip6_dst_destroy(), fib6_drop_pcpu_from() and rt6_remove_exception() > are writers vs rt->from, and use non consistent synchronization among > themselves. > > Switching to xchg() will solve the issues with no possible > lockdep issues. Acked-by: Martin KaFai Lau <kafai@...com>
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