linux-kernel - [ 01/42] aio: fix possible invalid memory access when DEBUG is enabled

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Message-Id: <20130429184752.590511401@linuxfoundation.org>
Date:	Mon, 29 Apr 2013 12:01:43 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Zhao Hongjiang <zhaohongjiang@...wei.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 01/42] aio: fix possible invalid memory access when DEBUG is enabled

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhao Hongjiang <zhaohongjiang@...wei.com>

commit 91d80a84bbc8f28375cca7e65ec666577b4209ad upstream.

dprintk() shouldn't access @ring after it's unmapped.

Signed-off-by: Zhao Hongjiang <zhaohongjiang@...wei.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/aio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1027,9 +1027,9 @@ static int aio_read_evt(struct kioctx *i
 	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;
 }
 


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