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

From: Greg Kroah-Hartman
Date: Mon Apr 29 2013 - 15:47:44 EST

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


From: Zhao Hongjiang <zhaohongjiang@xxxxxxxxxx>

commit 91d80a84bbc8f28375cca7e65ec666577b4209ad upstream.

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

Signed-off-by: Zhao Hongjiang <zhaohongjiang@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

- 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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