From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Fri, 22 Jan 2016 01:28:38 +0000 (+0800)
Subject: btrfs: async-thread: Fix a use-after-free error for trace
X-Git-Tag: v4.1.22~154
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b9a54ed91c7bbd5c18a4170be078d9f7e28560ed;p=platform%2Fkernel%2Flinux-exynos.git

btrfs: async-thread: Fix a use-after-free error for trace

[ Upstream commit 0a95b851370b84a4b9d92ee6d1fa0926901d0454 ]

Parameter of trace_btrfs_work_queued() can be freed in its workqueue.
So no one use use that pointer after queue_work().

Fix the user-after-free bug by move the trace line before queue_work().

Reported-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---

diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index df9932b..1848705 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -316,8 +316,8 @@ static inline void __btrfs_queue_work(struct __btrfs_workqueue *wq,
 		list_add_tail(&work->ordered_list, &wq->ordered_list);
 		spin_unlock_irqrestore(&wq->list_lock, flags);
 	}
-	queue_work(wq->normal_wq, &work->normal_work);
 	trace_btrfs_work_queued(work);
+	queue_work(wq->normal_wq, &work->normal_work);
 }
 
 void btrfs_queue_work(struct btrfs_workqueue *wq,