commit 91d80a84bbc8f28375cca7e65ec666577b4209ad
author Zhao Hongjiang <zhaohongjiang@huawei.com> Fri Apr 26 11:03:53 2013 +0800
committer Linus Torvalds <torvalds@linux-foundation.org> Fri Apr 26 07:56:18 2013 -0700
tree 9b3ace831ebff07b31384e8046f88f1c0399bd6c
parent 697dfd884438058b15032b0169887c742704434a

aio: fix possible invalid memory access when DEBUG is enabled

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

Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/aio.c

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 @@
 	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;
 }