ip6_gre: add validation for csum_start
Validate csum_start in gre_handle_offloads before we call _gre_xmit so that we do not crash later when the csum_start value is used in the lco_csum function call. This patch deals with ipv6 code. Fixes: Fixes: b05229f44228 ("gre6: Cleanup GREv6 transmit path, call common GRE functions") Reported-by: syzbot+ff8e1b9f2f36481e2efc@syzkaller.appspotmail.com Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -629,6 +629,8 @@ drop:
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static int gre_handle_offloads(struct sk_buff *skb, bool csum)
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{
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if (csum && skb_checksum_start(skb) < skb->data)
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return -EINVAL;
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return iptunnel_handle_offloads(skb,
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csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
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}
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