Re: [PATCH net] gtp: allow -1 to be specified as file description from userspace

Existing user space applications maintained by the Osmocom project are breaking since a recent fix that addresses incorrect error checking. Restore operation for user space programs that specify -1 as file descriptor to skip GTPv0 or GTPv1 only sockets. Fixes: defd8b3c37b0 ("gtp: fix a potential NULL pointer dereference") Reported-by: Pau Espin Pedrol <pespin(a)sysmocom.de> Signed-off-by: Pablo Neira Ayuso <pablo(a)netfilter.org> [...]