CVE-2019-20096

If dccp_feat_push_change fails, we forget free the mem
which is alloced by kmemdup in dccp_feat_clone_sp_val.
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: e8ef967a ("dccp: Registration routines for changing feature values")
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 1d3ff095)
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Acked-by: Khalid Elmously <khalid.elmously@canonical.com>
Acked-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>