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Date: Thu, 5 Dec 2019 19:39:02 -0800 From: Cong Wang <xiyou.wangcong@...il.com> To: netdev@...r.kernel.org Cc: Cong Wang <xiyou.wangcong@...il.com>, Lorenzo Bianconi <lorenzo.bianconi@...hat.com> Subject: [Patch net] gre: refetch erspan header from skb->data after pskb_may_pull() After pskb_may_pull() we should always refetch the header pointers from the skb->data in case it got reallocated. In gre_parse_header(), the erspan header is still fetched from the 'options' pointer which is fetched before pskb_may_pull(). Found this during code review of a KMSAN bug report. Fixes: cb73ee40b1b3 ("net: ip_gre: use erspan key field for tunnel lookup") Cc: Lorenzo Bianconi <lorenzo.bianconi@...hat.com> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com> --- net/ipv4/gre_demux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c index 44bfeecac33e..5fd6e8ed02b5 100644 --- a/net/ipv4/gre_demux.c +++ b/net/ipv4/gre_demux.c @@ -127,7 +127,7 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, if (!pskb_may_pull(skb, nhs + hdr_len + sizeof(*ershdr))) return -EINVAL; - ershdr = (struct erspan_base_hdr *)options; + ershdr = (struct erspan_base_hdr *)(skb->data + nhs + hdr_len); tpi->key = cpu_to_be32(get_session_id(ershdr)); } -- 2.21.0
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