linux-kernel - aio: fix a user triggered use after free

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Date:   Sat, 29 Oct 2016 09:44:28 +0200
From:   Christoph Hellwig <hch@....de>
To:     torvalds@...ux-foundation.org, viro@...iv.linux.org.uk
Cc:     jack@...e.cz, dmonakhov@...nvz.org, jmoyer@...hat.com,
        linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
        linux-kernel@...r.kernel.org
Subject: aio: fix a user triggered use after free

Hi Linus,

the patch below fixes a use after free triggered if one threads closes
a file descriptor after another just started an aio operation.

The patch is originally from Jan with some updates from me - I tried
to get in through Al but I haven't managed to get him to respond yet,
but I'd really like to get into the tree, -stable and the distros ASAP.