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If an ip6gre interface is queried, the resulting link local address string of 47 byte overflowed the buffer of 32 bytes used to hold the translated address. Increase the address string buffer to 48 byte and check the address length prior to writing it into the buffer to avoid future problems with longs link local addresses. Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>