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pidns: fix free_pid() to handle the first fork failure

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"case 0" in free_pid() assumes that disable_pid_allocation() should
clear PIDNS_HASH_ADDING before the last pid goes away.

However this doesn't happen if the first fork() fails to create the
child reaper which should call disable_pid_allocation().

Signed-off-by: Oleg Nesterov <[email protected]>
Reviewed-by: "Eric W. Biederman" <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2013-09-30 13:45:27 -07:00 • committed by Linus Torvalds
commit 314a8ad0f1
1 changed files with 5 additions and 0 deletions
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5
kernel/pid.c
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@ -273,6 +273,11 @@ void free_pid(struct pid *pid)
*/
wake_up_process(ns->child_reaper);
break;
case PIDNS_HASH_ADDING:
/* Handle a fork failure of the first process */
WARN_ON(ns->child_reaper);
ns->nr_hashed = 0;
/* fall through */
case 0:
schedule_work(&ns->proc_work);
break;