NFSv4: Fix free of uninitialized nfs4_label on referral lookup.

Send along the already-allocated fattr along with nfs4_fs_locations, and
drop the memcpy of fattr.  We end up growing two more allocations, but this
fixes up a crash as:

PID: 790    TASK: ffff88811b43c000  CPU: 0   COMMAND: "ls"
 #0 [ffffc90000857920] panic at ffffffff81b9bfde
 #1 [ffffc900008579c0] do_trap at ffffffff81023a9b
 #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78
 #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45
 #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de
 #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs]
 #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f
 #7 [ffffc90000857c60] walk_component at ffffffff813a86c4
 #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553
 #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b

Suggested-by: Trond Myklebust <trondmy@hammerspace.com>
Fixes: 9558a007db ("NFS: Remove the label from the nfs4_lookup_res struct")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/nfs4namespace.c

@@ -417,6 +417,9 @@ static int nfs_do_refmount(struct fs_context *fc, struct rpc_clnt *client)
 	fs_locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
 	if (!fs_locations)
 		goto out_free;
+	fs_locations->fattr = nfs_alloc_fattr();
+	if (!fs_locations->fattr)
+		goto out_free_2;
 
 	/* Get locations */
 	dentry = ctx->clone_data.dentry;
@@ -427,14 +430,16 @@ static int nfs_do_refmount(struct fs_context *fc, struct rpc_clnt *client)
 	err = nfs4_proc_fs_locations(client, d_inode(parent), &dentry->d_name, fs_locations, page);
 	dput(parent);
 	if (err != 0)
-		goto out_free_2;
+		goto out_free_3;
 
 	err = -ENOENT;
 	if (fs_locations->nlocations <= 0 ||
 	    fs_locations->fs_path.ncomponents <= 0)
-		goto out_free_2;
+		goto out_free_3;
 
 	err = nfs_follow_referral(fc, fs_locations);
+out_free_3:
+	kfree(fs_locations->fattr);
 out_free_2:
 	kfree(fs_locations);
 out_free:

fs/nfs/nfs4proc.c

@@ -4247,6 +4247,8 @@ static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
 	if (locations == NULL)
 		goto out;
 
+	locations->fattr = fattr;
+
 	status = nfs4_proc_fs_locations(client, dir, name, locations, page);
 	if (status != 0)
 		goto out;
@@ -4256,17 +4258,14 @@ static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
 	 * referral.  Cause us to drop into the exception handler, which
 	 * will kick off migration recovery.
 	 */
-	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
+	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
 		dprintk("%s: server did not return a different fsid for"
 			" a referral at %s\n", __func__, name->name);
 		status = -NFS4ERR_MOVED;
 		goto out;
 	}
 	/* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
-	nfs_fixup_referral_attributes(&locations->fattr);
-
-	/* replace the lookup nfs_fattr with the locations nfs_fattr */
-	memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
+	nfs_fixup_referral_attributes(fattr);
 	memset(fhandle, 0, sizeof(struct nfs_fh));
 out:
 	if (page)
@@ -7979,7 +7978,7 @@ static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
 	else
 		bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
 
-	nfs_fattr_init(&fs_locations->fattr);
+	nfs_fattr_init(fs_locations->fattr);
 	fs_locations->server = server;
 	fs_locations->nlocations = 0;
 	status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
@@ -8044,7 +8043,7 @@ static int _nfs40_proc_get_locations(struct nfs_server *server,
 	unsigned long now = jiffies;
 	int status;
 
-	nfs_fattr_init(&locations->fattr);
+	nfs_fattr_init(locations->fattr);
 	locations->server = server;
 	locations->nlocations = 0;
 
@@ -8109,7 +8108,7 @@ static int _nfs41_proc_get_locations(struct nfs_server *server,
 	};
 	int status;
 
-	nfs_fattr_init(&locations->fattr);
+	nfs_fattr_init(locations->fattr);
 	locations->server = server;
 	locations->nlocations = 0;
 

fs/nfs/nfs4state.c

@@ -2116,6 +2116,11 @@ static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred
 		dprintk("<-- %s: no memory\n", __func__);
 		goto out;
 	}
+	locations->fattr = nfs_alloc_fattr();
+	if (locations->fattr == NULL) {
+		dprintk("<-- %s: no memory\n", __func__);
+		goto out;
+	}
 
 	inode = d_inode(server->super->s_root);
 	result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
@@ -2130,7 +2135,7 @@ static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred
 	if (!locations->nlocations)
 		goto out;
 
-	if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
+	if (!(locations->fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
 		dprintk("<-- %s: No fs_locations data, migration skipped\n",
 			__func__);
 		goto out;
@@ -2155,6 +2160,8 @@ static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred
 out:
 	if (page != NULL)
 		__free_page(page);
+	if (locations != NULL)
+		kfree(locations->fattr);
 	kfree(locations);
 	if (result) {
 		pr_err("NFS: migration recovery failed (server %s)\n",

fs/nfs/nfs4xdr.c

@@ -7080,7 +7080,7 @@ static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
 	if (res->migration) {
 		xdr_enter_page(xdr, PAGE_SIZE);
 		status = decode_getfattr_generic(xdr,
-					&res->fs_locations->fattr,
+					res->fs_locations->fattr,
 					 NULL, res->fs_locations,
 					 res->fs_locations->server);
 		if (status)
@@ -7093,7 +7093,7 @@ static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
 			goto out;
 		xdr_enter_page(xdr, PAGE_SIZE);
 		status = decode_getfattr_generic(xdr,
-					&res->fs_locations->fattr,
+					res->fs_locations->fattr,
 					 NULL, res->fs_locations,
 					 res->fs_locations->server);
 	}

include/linux/nfs_xdr.h

@@ -1222,7 +1222,7 @@ struct nfs4_fs_location {
 
 #define NFS4_FS_LOCATIONS_MAXENTRIES 10
 struct nfs4_fs_locations {
-	struct nfs_fattr fattr;
+	struct nfs_fattr *fattr;
 	const struct nfs_server *server;
 	struct nfs4_pathname fs_path;
 	int nlocations;