linux-kernel - [PATCH 1/1] kernel/pid.c: Masking the flag out to get the actual value.

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Message-Id: <1370901398-8989-1-git-send-email-raphael.scarv@gmail.com>
Date:	Mon, 10 Jun 2013 18:56:38 -0300
From:	"Raphael S. Carvalho" <raphael.scarv@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	"Raphael S.Carvalho" <raphael.scarv@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Raphael S. Carvalho" <raphael.scarv@...il.com>
Subject: [PATCH 1/1] kernel/pid.c: Masking the flag out to get the actual value.

This patch shouldn't be applied if those branches must only be taken when
the pid_allocation(PIDNS_HASH_ADDING) flag was turned off.
Otherwise, we must turn the PIDNS_HASH_ADDING flag (1U << 31) off
before getting into the switch-cases.

Signed-off-by: Raphael S. Carvalho <raphael.scarv@...il.com>
---
 kernel/pid.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 0db3e79..6bda527 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -263,7 +263,10 @@ void free_pid(struct pid *pid)
 		struct upid *upid = pid->numbers + i;
 		struct pid_namespace *ns = upid->ns;
 		hlist_del_rcu(&upid->pid_chain);
-		switch(--ns->nr_hashed) {
+
+		/* We must turn the PIDNS_HASH_ADDING flag off to
+		   get the actual value of nr_hashed */
+		switch ((--ns->nr_hashed) & ~(PIDNS_HASH_ADDING)) {
 		case 1:
 			/* When all that is left in the pid namespace
 			 * is the reaper wake up the reaper.  The reaper
-- 
1.7.2.5

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