This is a note to let you know that I have just added a patch titled
xfs: Fix possible use-after-free with AIO
to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Herton
------
>From 4bf193f525ba48ec92bd710b6f2298c24f6c83a6 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@xxxxxxx>
Date: Wed, 23 Jan 2013 13:56:18 +0100
Subject: [PATCH] xfs: Fix possible use-after-free with AIO
commit 4b05d09c18d9aa62d2e7fb4b057f54e5a38963f5 upstream.
Running AIO is pinning inode in memory using file reference. Once AIO
is completed using aio_complete(), file reference is put and inode can
be freed from memory. So we have to be sure that calling aio_complete()
is the last thing we do with the inode.
CC: xfs@xxxxxxxxxxx
CC: Ben Myers <bpm@xxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Ben Myers <bpm@xxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
---
fs/xfs/xfs_aops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 8dad722..6868548 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -86,11 +86,11 @@ xfs_destroy_ioend(
}
if (ioend->io_iocb) {
+ inode_dio_done(ioend->io_inode);
if (ioend->io_isasync) {
aio_complete(ioend->io_iocb, ioend->io_error ?
ioend->io_error : ioend->io_result, 0);
}
- inode_dio_done(ioend->io_inode);
}
mempool_free(ioend, xfs_ioend_pool);
--
1.7.9.5
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