NFSv4: Check for NULL argument in nfs_*_seqid() functions
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index b922e43..590f096 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1015,7 +1015,7 @@
{
struct nfs_seqid_counter *sequence;
- if (list_empty(&seqid->list))
+ if (seqid == NULL || list_empty(&seqid->list))
return;
sequence = seqid->sequence;
spin_lock(&sequence->lock);
@@ -1071,13 +1071,15 @@
void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
{
- struct nfs4_state_owner *sp = container_of(seqid->sequence,
- struct nfs4_state_owner, so_seqid);
- struct nfs_server *server = sp->so_server;
+ struct nfs4_state_owner *sp;
+ if (seqid == NULL)
+ return;
+
+ sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
if (status == -NFS4ERR_BAD_SEQID)
nfs4_drop_state_owner(sp);
- if (!nfs4_has_session(server->nfs_client))
+ if (!nfs4_has_session(sp->so_server->nfs_client))
nfs_increment_seqid(status, seqid);
}
@@ -1088,14 +1090,18 @@
*/
void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
{
- nfs_increment_seqid(status, seqid);
+ if (seqid != NULL)
+ nfs_increment_seqid(status, seqid);
}
int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
{
- struct nfs_seqid_counter *sequence = seqid->sequence;
+ struct nfs_seqid_counter *sequence;
int status = 0;
+ if (seqid == NULL)
+ goto out;
+ sequence = seqid->sequence;
spin_lock(&sequence->lock);
seqid->task = task;
if (list_empty(&seqid->list))
@@ -1106,6 +1112,7 @@
status = -EAGAIN;
unlock:
spin_unlock(&sequence->lock);
+out:
return status;
}
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 7e7be5a..d05fada 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -946,7 +946,10 @@
static void encode_nfs4_seqid(struct xdr_stream *xdr,
const struct nfs_seqid *seqid)
{
- encode_uint32(xdr, seqid->sequence->counter);
+ if (seqid != NULL)
+ encode_uint32(xdr, seqid->sequence->counter);
+ else
+ encode_uint32(xdr, 0);
}
static void encode_compound_hdr(struct xdr_stream *xdr,