[3.13.y.z extended stable] Patch "NFSv4: Fix a use-after-free problem in open()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    NFSv4: Fix a use-after-free problem in open()

to the linux-3.13.y-queue branch of the 3.13.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-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.1.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 82dfe7761bca24785a2946b8a238d1f96b66527d Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust at primarydata.com>
Date: Wed, 26 Mar 2014 13:24:37 -0700
Subject: NFSv4: Fix a use-after-free problem in open()

commit e911b8158ee1def8153849b1641b736026b036e0 upstream.

If we interrupt the nfs4_wait_for_completion_rpc_task() call in
nfs4_run_open_task(), then we don't prevent the RPC call from
completing. So freeing up the opendata->f_attr.mdsthreshold
in the error path in _nfs4_do_open() leads to a use-after-free
when the XDR decoder tries to decode the mdsthreshold information
from the server.

Fixes: 82be417aa37c0 (NFSv4.1 cache mdsthreshold values on OPEN)
Tested-by: Steve Dickson <SteveD at redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust at primarydata.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 fs/nfs/nfs4proc.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 0e90bf0..134691e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1070,6 +1070,7 @@ static void nfs4_opendata_free(struct kref *kref)
 	dput(p->dentry);
 	nfs_sb_deactive(sb);
 	nfs_fattr_free_names(&p->f_attr);
+	kfree(p->f_attr.mdsthreshold);
 	kfree(p);
 }

@@ -2246,10 +2247,12 @@ static int _nfs4_do_open(struct inode *dir,
 		}
 	}

-	if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
-		opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
-		if (!opendata->f_attr.mdsthreshold)
-			goto err_free_label;
+	if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
+		if (!opendata->f_attr.mdsthreshold) {
+			opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
+			if (!opendata->f_attr.mdsthreshold)
+				goto err_free_label;
+		}
 		opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
 	}
 	if (dentry->d_inode != NULL)
@@ -2277,11 +2280,10 @@ static int _nfs4_do_open(struct inode *dir,
 	if (opendata->file_created)
 		*opened |= FILE_CREATED;

-	if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
+	if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
 		*ctx_th = opendata->f_attr.mdsthreshold;
-	else
-		kfree(opendata->f_attr.mdsthreshold);
-	opendata->f_attr.mdsthreshold = NULL;
+		opendata->f_attr.mdsthreshold = NULL;
+	}

 	nfs4_label_free(olabel);

@@ -2291,7 +2293,6 @@ static int _nfs4_do_open(struct inode *dir,
 err_free_label:
 	nfs4_label_free(olabel);
 err_opendata_put:
-	kfree(opendata->f_attr.mdsthreshold);
 	nfs4_opendata_put(opendata);
 err_put_state_owner:
 	nfs4_put_state_owner(sp);
--
1.9.1