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Commit 31434f49 authored by Peng Tao's avatar Peng Tao Committed by Trond Myklebust
Browse files

nfs: check hostname in nfs_get_client 



We reference cl_hostname in many places. Add a check to make
sure it exists.

Signed-off-by: default avatarPeng Tao <tao.peng@primarydata.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent a363e32e

fs/nfs/client.c

+7 −2
Original line number Original line Diff line number Diff line
@@ -482,8 +482,13 @@ nfs_get_client(const struct nfs_client_initdata *cl_init, 
	struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);

	struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);

	const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;

	const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;





	if (cl_init->hostname == NULL) {

		WARN_ON(1);

		return NULL;

	}



	dprintk("--> nfs_get_client(%s,v%u)\n",

	dprintk("--> nfs_get_client(%s,v%u)\n",

		cl_init->hostname ?: "", rpc_ops->version);

		cl_init->hostname, rpc_ops->version);





	/* see if the client already exists */

	/* see if the client already exists */

	do {

	do {
@@ -510,7 +515,7 @@ nfs_get_client(const struct nfs_client_initdata *cl_init, 
	} while (!IS_ERR(new));

	} while (!IS_ERR(new));





	dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",

	dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",

		cl_init->hostname ?: "", PTR_ERR(new));

		cl_init->hostname, PTR_ERR(new));

	return new;

	return new;

}

}

EXPORT_SYMBOL_GPL(nfs_get_client);

EXPORT_SYMBOL_GPL(nfs_get_client);