NFSv4: Fix memory corruption in nfs4_proc_open_confirm

nfs41_wake_and_assign_slot() relies on the task->tk_msg.rpc_argp and
task->tk_msg.rpc_resp always pointing to the session sequence arguments.

nfs4_proc_open_confirm tries to pull a fast one by reusing the open
sequence structure, thus causing corruption of the NFSv4 slot table.

Cc: stable@vger.kernel.org # 3.12+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 3ccfcecf8999..b2fb167b2e6d 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -379,12 +379,14 @@ struct nfs_openres {
  * Arguments to the open_confirm call.
  */
 struct nfs_open_confirmargs {
+        struct nfs4_sequence_args       seq_args;
         const struct nfs_fh *   fh;
         nfs4_stateid *          stateid;
         struct nfs_seqid *      seqid;
 };
 
 struct nfs_open_confirmres {
+        struct nfs4_sequence_res        seq_res;
         nfs4_stateid            stateid;
         struct nfs_seqid *      seqid;
 };