ipv6: ipv6_find_hdr restore prev functionality
The commit 9195bb8e ("ipv6: improve ipv6_find_hdr() to skip empty routing headers") broke ipv6_find_hdr(). When a target is specified like IPPROTO_ICMPV6 ipv6_find_hdr() returns -ENOENT when it's found, not the header as expected. A part of IPVS is broken and possible also nft_exthdr_eval(). When target is -1 which it is most cases, it works. This patch exits the do while loop if the specific header is found so the nexthdr could be returned as expected. Reported-by: Art -kwaak- van Breemen <ard@telegraafnet.nl> Signed-off-by: Hans Schillstrom <hans@schillstrom.com> CC:Ansis Atteka <aatteka@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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