linux-kernel - [PATCH linux-next] mm: fix rcu-lock/unlock balance in vm_is

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Date:	Wed, 21 Mar 2012 00:54:55 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH linux-next] mm: fix rcu-lock/unlock balance in vm_is_stack()

Fix bug introduced in "procfs: mark thread stack correctly in proc/<pid>/maps"
(patch in mm/linux-next)

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 mm/memory.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index ee85fc4..cc08b86 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3932,13 +3932,12 @@ pid_t vm_is_stack(struct task_struct *task,
 		while_each_thread(task, t) {
 			if (vm_is_stack_for_task(t, vma)) {
 				ret = t->pid;
-				goto done;
+				break;
 			}
 		}
+		rcu_read_unlock();
 	}
 
-done:
-	rcu_read_unlock();
 	return ret;
 }
 

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