linux-kernel - [PATCH] aio: dprintks in aio_read_evt were referencing aio_ring after kunmap

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Date:	Thu, 25 Apr 2013 18:02:21 +0800
From:	Zhao Hongjiang <zhaohongjiang@...wei.com>
To:	<viro@...iv.linux.org.uk>
CC:	<bcrl@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-aio@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] aio: dprintks in aio_read_evt were referencing aio_ring after
 kunmap_atomic


Signed-off-by: Zhao Hongjiang <zhaohongjiang@...wei.com>
Cc: stable@...r.kernel.org
---

linux-next use pr_debug instead of dprintk, and fix the issue.

---
 fs/aio.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 3f941f2..1dc8786 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1029,9 +1029,9 @@ static int aio_read_evt(struct kioctx *ioctx, struct io_event *ent)
 	spin_unlock(&info->ring_lock);
 
 out:
-	kunmap_atomic(ring);
 	dprintk("leaving aio_read_evt: %d  h%lu t%lu\n", ret,
 		 (unsigned long)ring->head, (unsigned long)ring->tail);
+	kunmap_atomic(ring);
 	return ret;
 }
 
-- 
1.7.1

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