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pids: sys_setpgid: use change_pid() helper 

Use change_pid() instead of detach_pid() + attach_pid() in sys_setpgid().

This way task_pgrp() is not NULL in between.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc:  "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-04-30 00:54:27 -07:00 committed by Linus Torvalds
parent 24336eaeec
commit 83beaf3c6c
1 changed files with 1 additions and 2 deletions
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3
kernel/sys.c
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@ -978,8 +978,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
goto out;
if (task_pgrp(p) != pgrp) {
detach_pid(p, PIDTYPE_PGID);
attach_pid(p, PIDTYPE_PGID, pgrp);
change_pid(p, PIDTYPE_PGID, pgrp);
set_task_pgrp(p, pid_nr(pgrp));
}