Merge tag 'nfsd-4.9-1' of git://linux-nfs.org/~bfields/linux

Pull nfsd bugfixes from Bruce Fields:
 "Fixes for some recent regressions including fallout from the vmalloc'd
  stack change (after which we can no longer encrypt stuff on the
  stack)"

* tag 'nfsd-4.9-1' of git://linux-nfs.org/~bfields/linux:
  nfsd: Fix general protection fault in release_lock_stateid()
  svcrdma: backchannel cannot share a page for send and rcv buffers
  sunrpc: fix some missing rq_rbuffer assignments
  sunrpc: don't pass on-stack memory to sg_set_buf
  nfsd: move blocked lock handling under a dedicated spinlock

7 files changed, 106 insertions, 66 deletions

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index b10d557f9c9e..ee36efd5aece 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -84,6 +84,8 @@ struct nfsd_net {
 	struct list_head client_lru;
 	struct list_head close_lru;
 	struct list_head del_recall_lru;
+
+	/* protected by blocked_locks_lock */
 	struct list_head blocked_locks_lru;
 
 	struct delayed_work laundromat_work;
@@ -91,6 +93,9 @@ struct nfsd_net {
 	/* client_lock protects the client lru list and session hash table */
 	spinlock_t client_lock;
 
+	/* protects blocked_locks_lru */
+	spinlock_t blocked_locks_lock;
+
 	struct file *rec_file;
 	bool in_grace;
 	const struct nfsd4_client_tracking_ops *client_tracking_ops;
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9752beb78659..4b4beaaa4eaa 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -217,7 +217,7 @@ find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 {
 	struct nfsd4_blocked_lock *cur, *found = NULL;
 
-	spin_lock(&nn->client_lock);
+	spin_lock(&nn->blocked_locks_lock);
 	list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
 		if (fh_match(fh, &cur->nbl_fh)) {
 			list_del_init(&cur->nbl_list);
@@ -226,7 +226,7 @@ find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 			break;
 		}
 	}
-	spin_unlock(&nn->client_lock);
+	spin_unlock(&nn->blocked_locks_lock);
 	if (found)
 		posix_unblock_lock(&found->nbl_lock);
 	return found;
@@ -1227,9 +1227,7 @@ static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
 
 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
 {
-	struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
-
-	lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);
+	lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
 
 	list_del_init(&stp->st_locks);
 	nfs4_unhash_stid(&stp->st_stid);
@@ -1238,12 +1236,12 @@ static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
 
 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 {
-	struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
+	struct nfs4_client *clp = stp->st_stid.sc_client;
 	bool unhashed;
 
-	spin_lock(&oo->oo_owner.so_client->cl_lock);
+	spin_lock(&clp->cl_lock);
 	unhashed = unhash_lock_stateid(stp);
-	spin_unlock(&oo->oo_owner.so_client->cl_lock);
+	spin_unlock(&clp->cl_lock);
 	if (unhashed)
 		nfs4_put_stid(&stp->st_stid);
 }
@@ -4665,7 +4663,7 @@ nfs4_laundromat(struct nfsd_net *nn)
 	 * indefinitely once the lock does become free.
 	 */
 	BUG_ON(!list_empty(&reaplist));
-	spin_lock(&nn->client_lock);
+	spin_lock(&nn->blocked_locks_lock);
 	while (!list_empty(&nn->blocked_locks_lru)) {
 		nbl = list_first_entry(&nn->blocked_locks_lru,
 					struct nfsd4_blocked_lock, nbl_lru);
@@ -4678,7 +4676,7 @@ nfs4_laundromat(struct nfsd_net *nn)
 		list_move(&nbl->nbl_lru, &reaplist);
 		list_del_init(&nbl->nbl_list);
 	}
-	spin_unlock(&nn->client_lock);
+	spin_unlock(&nn->blocked_locks_lock);
 
 	while (!list_empty(&reaplist)) {
 		nbl = list_first_entry(&nn->blocked_locks_lru,
@@ -5439,13 +5437,13 @@ nfsd4_lm_notify(struct file_lock *fl)
 	bool queue = false;
 
 	/* An empty list means that something else is going to be using it */
-	spin_lock(&nn->client_lock);
+	spin_lock(&nn->blocked_locks_lock);
 	if (!list_empty(&nbl->nbl_list)) {
 		list_del_init(&nbl->nbl_list);
 		list_del_init(&nbl->nbl_lru);
 		queue = true;
 	}
-	spin_unlock(&nn->client_lock);
+	spin_unlock(&nn->blocked_locks_lock);
 
 	if (queue)
 		nfsd4_run_cb(&nbl->nbl_cb);
@@ -5868,10 +5866,10 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 
 	if (fl_flags & FL_SLEEP) {
 		nbl->nbl_time = jiffies;
-		spin_lock(&nn->client_lock);
+		spin_lock(&nn->blocked_locks_lock);
 		list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
 		list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
-		spin_unlock(&nn->client_lock);
+		spin_unlock(&nn->blocked_locks_lock);
 	}
 
 	err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
@@ -5900,10 +5898,10 @@ out:
 	if (nbl) {
 		/* dequeue it if we queued it before */
 		if (fl_flags & FL_SLEEP) {
-			spin_lock(&nn->client_lock);
+			spin_lock(&nn->blocked_locks_lock);
 			list_del_init(&nbl->nbl_list);
 			list_del_init(&nbl->nbl_lru);
-			spin_unlock(&nn->client_lock);
+			spin_unlock(&nn->blocked_locks_lock);
 		}
 		free_blocked_lock(nbl);
 	}
@@ -6943,9 +6941,11 @@ static int nfs4_state_create_net(struct net *net)
 	INIT_LIST_HEAD(&nn->client_lru);
 	INIT_LIST_HEAD(&nn->close_lru);
 	INIT_LIST_HEAD(&nn->del_recall_lru);
-	INIT_LIST_HEAD(&nn->blocked_locks_lru);
 	spin_lock_init(&nn->client_lock);
 
+	spin_lock_init(&nn->blocked_locks_lock);
+	INIT_LIST_HEAD(&nn->blocked_locks_lru);
+
 	INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
 	get_net(net);
 
@@ -7063,14 +7063,14 @@ nfs4_state_shutdown_net(struct net *net)
 	}
 
 	BUG_ON(!list_empty(&reaplist));
-	spin_lock(&nn->client_lock);
+	spin_lock(&nn->blocked_locks_lock);
 	while (!list_empty(&nn->blocked_locks_lru)) {
 		nbl = list_first_entry(&nn->blocked_locks_lru,
 					struct nfsd4_blocked_lock, nbl_lru);
 		list_move(&nbl->nbl_lru, &reaplist);
 		list_del_init(&nbl->nbl_list);
 	}
-	spin_unlock(&nn->client_lock);
+	spin_unlock(&nn->blocked_locks_lock);
 
 	while (!list_empty(&reaplist)) {
 		nbl = list_first_entry(&nn->blocked_locks_lru,
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index d8bd97a5a7c9..3dfd769dc5b5 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -1616,7 +1616,7 @@ gss_validate(struct rpc_task *task, __be32 *p)
 {
 	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
 	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
-	__be32		seq;
+	__be32		*seq = NULL;
 	struct kvec	iov;
 	struct xdr_buf	verf_buf;
 	struct xdr_netobj mic;
@@ -1631,9 +1631,12 @@ gss_validate(struct rpc_task *task, __be32 *p)
 		goto out_bad;
 	if (flav != RPC_AUTH_GSS)
 		goto out_bad;
-	seq = htonl(task->tk_rqstp->rq_seqno);
-	iov.iov_base = &seq;
-	iov.iov_len = sizeof(seq);
+	seq = kmalloc(4, GFP_NOFS);
+	if (!seq)
+		goto out_bad;
+	*seq = htonl(task->tk_rqstp->rq_seqno);
+	iov.iov_base = seq;
+	iov.iov_len = 4;
 	xdr_buf_from_iov(&iov, &verf_buf);
 	mic.data = (u8 *)p;
 	mic.len = len;
@@ -1653,11 +1656,13 @@ gss_validate(struct rpc_task *task, __be32 *p)
 	gss_put_ctx(ctx);
 	dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
 			task->tk_pid, __func__);
+	kfree(seq);
 	return p + XDR_QUADLEN(len);
 out_bad:
 	gss_put_ctx(ctx);
 	dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__,
 		PTR_ERR(ret));
+	kfree(seq);
 	return ret;
 }
 
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index 244245bcbbd2..90115ceefd49 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -166,8 +166,8 @@ make_checksum_hmac_md5(struct krb5_ctx *kctx, char *header, int hdrlen,
 		       unsigned int usage, struct xdr_netobj *cksumout)
 {
 	struct scatterlist              sg[1];
-	int err;
-	u8 checksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	int err = -1;
+	u8 *checksumdata;
 	u8 rc4salt[4];
 	struct crypto_ahash *md5;
 	struct crypto_ahash *hmac_md5;
@@ -187,23 +187,22 @@ make_checksum_hmac_md5(struct krb5_ctx *kctx, char *header, int hdrlen,
 		return GSS_S_FAILURE;
 	}
 
+	checksumdata = kmalloc(GSS_KRB5_MAX_CKSUM_LEN, GFP_NOFS);
+	if (!checksumdata)
+		return GSS_S_FAILURE;
+
 	md5 = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC);
 	if (IS_ERR(md5))
-		return GSS_S_FAILURE;
+		goto out_free_cksum;
 
 	hmac_md5 = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0,
 				      CRYPTO_ALG_ASYNC);
-	if (IS_ERR(hmac_md5)) {
-		crypto_free_ahash(md5);
-		return GSS_S_FAILURE;
-	}
+	if (IS_ERR(hmac_md5))
+		goto out_free_md5;
 
 	req = ahash_request_alloc(md5, GFP_KERNEL);
-	if (!req) {
-		crypto_free_ahash(hmac_md5);
-		crypto_free_ahash(md5);
-		return GSS_S_FAILURE;
-	}
+	if (!req)
+		goto out_free_hmac_md5;
 
 	ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
 
@@ -232,11 +231,8 @@ make_checksum_hmac_md5(struct krb5_ctx *kctx, char *header, int hdrlen,
 
 	ahash_request_free(req);
 	req = ahash_request_alloc(hmac_md5, GFP_KERNEL);
-	if (!req) {
-		crypto_free_ahash(hmac_md5);
-		crypto_free_ahash(md5);
-		return GSS_S_FAILURE;
-	}
+	if (!req)
+		goto out_free_hmac_md5;
 
 	ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
 
@@ -258,8 +254,12 @@ make_checksum_hmac_md5(struct krb5_ctx *kctx, char *header, int hdrlen,
 	cksumout->len = kctx->gk5e->cksumlength;
 out:
 	ahash_request_free(req);
-	crypto_free_ahash(md5);
+out_free_hmac_md5:
 	crypto_free_ahash(hmac_md5);
+out_free_md5:
+	crypto_free_ahash(md5);
+out_free_cksum:
+	kfree(checksumdata);
 	return err ? GSS_S_FAILURE : 0;
 }
 
@@ -276,8 +276,8 @@ make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
 	struct crypto_ahash *tfm;
 	struct ahash_request *req;
 	struct scatterlist              sg[1];
-	int err;
-	u8 checksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	int err = -1;
+	u8 *checksumdata;
 	unsigned int checksumlen;
 
 	if (kctx->gk5e->ctype == CKSUMTYPE_HMAC_MD5_ARCFOUR)
@@ -291,15 +291,17 @@ make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
 		return GSS_S_FAILURE;
 	}
 
+	checksumdata = kmalloc(GSS_KRB5_MAX_CKSUM_LEN, GFP_NOFS);
+	if (checksumdata == NULL)
+		return GSS_S_FAILURE;
+
 	tfm = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
 	if (IS_ERR(tfm))
-		return GSS_S_FAILURE;
+		goto out_free_cksum;
 
 	req = ahash_request_alloc(tfm, GFP_KERNEL);
-	if (!req) {
-		crypto_free_ahash(tfm);
-		return GSS_S_FAILURE;
-	}
+	if (!req)
+		goto out_free_ahash;
 
 	ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
 
@@ -349,7 +351,10 @@ make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
 	cksumout->len = kctx->gk5e->cksumlength;
 out:
 	ahash_request_free(req);
+out_free_ahash:
 	crypto_free_ahash(tfm);
+out_free_cksum:
+	kfree(checksumdata);
 	return err ? GSS_S_FAILURE : 0;
 }
 
@@ -368,8 +373,8 @@ make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
 	struct crypto_ahash *tfm;
 	struct ahash_request *req;
 	struct scatterlist sg[1];
-	int err;
-	u8 checksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	int err = -1;
+	u8 *checksumdata;
 	unsigned int checksumlen;
 
 	if (kctx->gk5e->keyed_cksum == 0) {
@@ -383,16 +388,18 @@ make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
 		return GSS_S_FAILURE;
 	}
 
+	checksumdata = kmalloc(GSS_KRB5_MAX_CKSUM_LEN, GFP_NOFS);
+	if (!checksumdata)
+		return GSS_S_FAILURE;
+
 	tfm = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
 	if (IS_ERR(tfm))
-		return GSS_S_FAILURE;
+		goto out_free_cksum;
 	checksumlen = crypto_ahash_digestsize(tfm);
 
 	req = ahash_request_alloc(tfm, GFP_KERNEL);
-	if (!req) {
-		crypto_free_ahash(tfm);
-		return GSS_S_FAILURE;
-	}
+	if (!req)
+		goto out_free_ahash;
 
 	ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
 
@@ -433,7 +440,10 @@ make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
 	}
 out:
 	ahash_request_free(req);
+out_free_ahash:
 	crypto_free_ahash(tfm);
+out_free_cksum:
+	kfree(checksumdata);
 	return err ? GSS_S_FAILURE : 0;
 }
 
@@ -666,14 +676,17 @@ gss_krb5_cts_crypt(struct crypto_skcipher *cipher, struct xdr_buf *buf,
 	u32 ret;
 	struct scatterlist sg[1];
 	SKCIPHER_REQUEST_ON_STACK(req, cipher);
-	u8 data[GSS_KRB5_MAX_BLOCKSIZE * 2];
+	u8 *data;
 	struct page **save_pages;
 	u32 len = buf->len - offset;
 
-	if (len > ARRAY_SIZE(data)) {
+	if (len > GSS_KRB5_MAX_BLOCKSIZE * 2) {
 		WARN_ON(0);
 		return -ENOMEM;
 	}
+	data = kmalloc(GSS_KRB5_MAX_BLOCKSIZE * 2, GFP_NOFS);
+	if (!data)
+		return -ENOMEM;
 
 	/*
 	 * For encryption, we want to read from the cleartext
@@ -708,6 +721,7 @@ gss_krb5_cts_crypt(struct crypto_skcipher *cipher, struct xdr_buf *buf,
 	ret = write_bytes_to_xdr_buf(buf, offset, data, len);
 
 out:
+	kfree(data);
 	return ret;
 }
 
diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index d67f7e1bc82d..45662d7f0943 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -718,30 +718,37 @@ gss_write_null_verf(struct svc_rqst *rqstp)
 static int
 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
 {
-	__be32			xdr_seq;
+	__be32			*xdr_seq;
 	u32			maj_stat;
 	struct xdr_buf		verf_data;
 	struct xdr_netobj	mic;
 	__be32			*p;
 	struct kvec		iov;
+	int err = -1;
 
 	svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
-	xdr_seq = htonl(seq);
+	xdr_seq = kmalloc(4, GFP_KERNEL);
+	if (!xdr_seq)
+		return -1;
+	*xdr_seq = htonl(seq);
 
-	iov.iov_base = &xdr_seq;
-	iov.iov_len = sizeof(xdr_seq);
+	iov.iov_base = xdr_seq;
+	iov.iov_len = 4;
 	xdr_buf_from_iov(&iov, &verf_data);
 	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
 	mic.data = (u8 *)(p + 1);
 	maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
 	if (maj_stat != GSS_S_COMPLETE)
-		return -1;
+		goto out;
 	*p++ = htonl(mic.len);
 	memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
 	p += XDR_QUADLEN(mic.len);
 	if (!xdr_ressize_check(rqstp, p))
-		return -1;
-	return 0;
+		goto out;
+	err = 0;
+out:
+	kfree(xdr_seq);
+	return err;
 }
 
 struct gss_domain {
diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
index 2d8545c34095..20027f8de129 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
@@ -177,18 +177,26 @@ xprt_rdma_bc_allocate(struct rpc_task *task)
 		return -EINVAL;
 	}
 
+	/* svc_rdma_sendto releases this page */
 	page = alloc_page(RPCRDMA_DEF_GFP);
 	if (!page)
 		return -ENOMEM;
-
 	rqst->rq_buffer = page_address(page);
+
+	rqst->rq_rbuffer = kmalloc(rqst->rq_rcvsize, RPCRDMA_DEF_GFP);
+	if (!rqst->rq_rbuffer) {
+		put_page(page);
+		return -ENOMEM;
+	}
 	return 0;
 }
 
 static void
 xprt_rdma_bc_free(struct rpc_task *task)
 {
-	/* No-op: ctxt and page have already been freed. */
+	struct rpc_rqst *rqst = task->tk_rqstp;
+
+	kfree(rqst->rq_rbuffer);
 }
 
 static int
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 0137af1c0916..e01c825bc683 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2563,6 +2563,7 @@ static int bc_malloc(struct rpc_task *task)
 	buf->len = PAGE_SIZE;
 
 	rqst->rq_buffer = buf->data;
+	rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
 	return 0;
 }