| From: Zhao Hongjiang <zhaohongjiang@huawei.com> |
| Date: Fri, 26 Apr 2013 11:03:53 +0800 |
| Subject: aio: fix possible invalid memory access when DEBUG is enabled |
| |
| commit 91d80a84bbc8f28375cca7e65ec666577b4209ad upstream. |
| |
| dprintk() shouldn't access @ring after it's unmapped. |
| |
| Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com> |
| Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
| [bwh: Backported to 3.2: keep the second argument to kunmap_atomic()] |
| Signed-off-by: Ben Hutchings <ben@decadent.org.uk> |
| --- |
| fs/aio.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/fs/aio.c |
| +++ b/fs/aio.c |
| @@ -1112,9 +1112,9 @@ static int aio_read_evt(struct kioctx *i |
| spin_unlock(&info->ring_lock); |
| |
| out: |
| - kunmap_atomic(ring, KM_USER0); |
| dprintk("leaving aio_read_evt: %d h%lu t%lu\n", ret, |
| (unsigned long)ring->head, (unsigned long)ring->tail); |
| + kunmap_atomic(ring, KM_USER0); |
| return ret; |
| } |
| |
