Messages in this thread | | | Date | Tue, 1 Aug 2023 19:07:39 -0600 | Subject | Re: [PATCH v4 1/2] drivers: net: prevent tun_build_skb() to exceed the packet size limit | From | David Ahern <> |
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On 8/1/23 4:07 PM, Andrew Kanner wrote: > @@ -1594,7 +1597,13 @@ static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, > if (zerocopy) > return false; > > - if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + > + rcu_read_lock(); > + xdp_prog = rcu_dereference(tun->xdp_prog); > + if (xdp_prog) > + pad += XDP_PACKET_HEADROOM; > + rcu_read_unlock();
since you do not care about the actual xdp_prog (only that one is set) I believe you can use rcu_access_pointer here.
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