git: tcp: Fix getcred

[Sepherosa Ziehau]

commit 16d3b971c298bb8dbcfc5ed147f5567134f59854
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Wed Sep 3 20:56:59 2014 +0800

    tcp: Fix getcred
    
    - Migrate to the target cpu before looking up tcp inpcb.
    - Save a copy of the ucred then do SYSCTL_OUT, which could block.
      It is not MPSAFE to do the SYSCTL_OUT even on the target CPU;
      the socket might be ripped when SYSCTL_OUT blocked.

Summary of changes:
 sys/netinet/tcp_subr.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/16d3b971c298bb8dbcfc5ed147f5567134f59854


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