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Date: Sat, 8 Aug 2020 03:16:01 -0400 From: Paul Hollinsky <phollinsky@...technik.com> To: netdev@...r.kernel.org Cc: davem@...emloft.net, kuba@...nel.org, andriin@...com, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com, kafai@...com, kpsingh@...omium.org, songliubraving@...com, yhs@...com, Paul Hollinsky <phollinsky@...technik.com> Subject: [PATCH] xdp: ensure initialization of txq in xdp_buff xdp->txq was uninitialized and could be used from within a bpf program. https://syzkaller.appspot.com/bug?id=a6e53f8e9044ea456ea1636be970518ae6ba7f62 Signed-off-by: Paul Hollinsky <phollinsky@...technik.com> --- net/core/dev.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/core/dev.c b/net/core/dev.c index 7df6c9617321..12be8fef8b7e 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4649,6 +4649,8 @@ static u32 netif_receive_generic_xdp(struct sk_buff *skb, rxqueue = netif_get_rxqueue(skb); xdp->rxq = &rxqueue->xdp_rxq; + xdp->txq = NULL; + act = bpf_prog_run_xdp(xdp_prog, xdp); /* check if bpf_xdp_adjust_head was used */ -- 2.25.1
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