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aio: fix possible invalid memory access when DEBUG is enabled

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BugLink: http://bugs.launchpad.net/bugs/1175391

commit 91d80a84bb 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
This commit is contained in:
Zhao Hongjiang
2013-04-26 11:03:53 +08:00
committed by Tim Gardner
parent 6e64e6a7c6
commit 6f1e36c1b3
1 changed files with 1 additions and 1 deletions
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2
fs/aio.c
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@@ -1027,9 +1027,9 @@ 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;
}