gre: fix netns vs proto registration ordering
BugLink: http://bugs.launchpad.net/bugs/823296 commit c2892f02 upstream. GRE protocol receive hook can be called right after protocol addition is done. If netns stuff is not yet initialized, we're going to oops in net_generic(). This is remotely oopsable if ip_gre is compiled as module and packet comes at unfortunate moment of module loading. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> [dannf: backported to Debian's 2.6.32] Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Stefan Bader <stefan.bader@canonical.com> Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
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