netfilter: uapi: Avoid undefined left-shift in xt_sctp.h

[mirror_ubuntu-bionic-kernel.git] / include / net / sctp / checksum.h

diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
index 32ee65a30aff1146dcafcc533e73833e190cb887..1c6e6c0766ca09b771d865883c7c4daf390215c6 100644 (file)
--- a/include/net/sctp/checksum.h
+++ b/include/net/sctp/checksum.h
@@ -61,7 +61,7 @@ static inline __wsum sctp_csum_combine(__wsum csum, __wsum csum2,
 static inline __le32 sctp_compute_cksum(const struct sk_buff *skb,
                                        unsigned int offset)
 {
-       struct sctphdr *sh = sctp_hdr(skb);
+       struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
        const struct skb_checksum_ops ops = {
                .update  = sctp_csum_update,
                .combine = sctp_csum_combine,