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NFSv4: Fix NFSv4 reference counting for trunked sessions
The reference counting in nfs4_init_client assumes wongly that it is safe for nfs4_discover_server_trunking() to return a pointer to a nfs_client prior to bumping the reference count. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Ben Greear <greearb@candelatech.com> Cc: stable@vger.kernel.org [>=3.7]
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parent
dee972b967
commit
4ae19c2dd7
1 changed files with 15 additions and 16 deletions
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@ -236,11 +236,10 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp,
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error = nfs4_discover_server_trunking(clp, &old);
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if (error < 0)
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goto error;
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nfs_put_client(clp);
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if (clp != old) {
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clp->cl_preserve_clid = true;
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nfs_put_client(clp);
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clp = old;
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atomic_inc(&clp->cl_count);
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}
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return clp;
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@ -306,7 +305,7 @@ int nfs40_walk_client_list(struct nfs_client *new,
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.clientid = new->cl_clientid,
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.confirm = new->cl_confirm,
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};
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int status;
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int status = -NFS4ERR_STALE_CLIENTID;
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spin_lock(&nn->nfs_client_lock);
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list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
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@ -332,28 +331,28 @@ int nfs40_walk_client_list(struct nfs_client *new,
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if (prev)
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nfs_put_client(prev);
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prev = pos;
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status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
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if (status == 0) {
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switch (status) {
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case -NFS4ERR_STALE_CLIENTID:
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break;
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case 0:
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nfs4_swap_callback_idents(pos, new);
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nfs_put_client(pos);
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prev = NULL;
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*result = pos;
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dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
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__func__, pos, atomic_read(&pos->cl_count));
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return 0;
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}
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if (status != -NFS4ERR_STALE_CLIENTID) {
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nfs_put_client(pos);
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dprintk("NFS: <-- %s status = %d, no result\n",
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__func__, status);
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return status;
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default:
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goto out;
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}
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spin_lock(&nn->nfs_client_lock);
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prev = pos;
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}
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spin_unlock(&nn->nfs_client_lock);
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out:
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/*
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* No matching nfs_client found. This should be impossible,
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* because the new nfs_client has already been added to
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@ -363,9 +362,8 @@ int nfs40_walk_client_list(struct nfs_client *new,
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*/
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if (prev)
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nfs_put_client(prev);
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spin_unlock(&nn->nfs_client_lock);
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pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
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return -NFS4ERR_STALE_CLIENTID;
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dprintk("NFS: <-- %s status = %d\n", __func__, status);
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return status;
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}
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#ifdef CONFIG_NFS_V4_1
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@ -473,6 +471,7 @@ int nfs41_walk_client_list(struct nfs_client *new,
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if (!nfs4_match_serverowners(pos, new))
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continue;
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atomic_inc(&pos->cl_count);
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spin_unlock(&nn->nfs_client_lock);
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dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
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__func__, pos, atomic_read(&pos->cl_count));
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