[PATCH] knfsd: nfsd4: fix non-terminated string

The server name is expected to be a null-terminated string, so we can't pass
in the raw client identifier.

What's more, the client identifier is just a binary, not necessarily
printable, blob.  Let's just use the ip address instead.  The server name
appears to exist just to help debugging by making some printk's more
informative.

Note that the string is copies into the rpc client structure, so the pointer
to the local variable does not outlive the function call.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index f57655a7a2b66b9ae1b1567e9d5500b581a5c9ae..fb14d68eacab846db08f92bbcdca7a1aff56e43c 100644 (file)
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -387,7 +387,6 @@ nfsd4_probe_callback(struct nfs4_client *clp)
                .address        = (struct sockaddr *)&addr,
                .addrsize       = sizeof(addr),
                .timeout        = &timeparms,
-               .servername     = clp->cl_name.data,
                .program        = program,
                .version        = nfs_cb_version[1]->number,
                .authflavor     = RPC_AUTH_UNIX,        /* XXX: need AUTH_GSS... */
@@ -397,6 +396,7 @@ nfsd4_probe_callback(struct nfs4_client *clp)
                .rpc_proc       = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
                .rpc_argp       = clp,
        };
+       char clientname[16];
        int status;
 
        if (atomic_read(&cb->cb_set))
@@ -419,6 +419,11 @@ nfsd4_probe_callback(struct nfs4_client *clp)
        memset(program->stats, 0, sizeof(cb->cb_stat));
        program->stats->program = program;
 
+       /* Just here to make some printk's more useful: */
+       snprintf(clientname, sizeof(clientname),
+               "%u.%u.%u.%u", NIPQUAD(addr.sin_addr));
+       args.servername = clientname;
+
        /* Create RPC client */
        cb->cb_client = rpc_create(&args);
        if (IS_ERR(cb->cb_client)) {