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>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 42da6af..2da6a69 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1620,15 +1620,15 @@ static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 {
        struct nfs4_opendata *data = calldata;
 
-       nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
-                               &data->o_res.seq_res, task);
+       nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
+                               &data->c_res.seq_res, task);
 }
 
 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 {
        struct nfs4_opendata *data = calldata;
 
-       nfs40_sequence_done(task, &data->o_res.seq_res);
+       nfs40_sequence_done(task, &data->c_res.seq_res);
 
        data->rpc_status = task->tk_status;
        if (data->rpc_status == 0) {
@@ -1686,7 +1686,7 @@ static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
        };
        int status;
 
-       nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
+       nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
        kref_get(&data->kref);
        data->rpc_done = 0;
        data->rpc_status = 0;

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 3ccfcec..b2fb167 100644 (file)
--- 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;
 };