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-rw-r--r--net/sunrpc/svc_xprt.c56
1 files changed, 39 insertions, 17 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index f200393ac87..6f33d33cc06 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -1098,36 +1098,58 @@ struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
}
EXPORT_SYMBOL_GPL(svc_find_xprt);
-/*
- * Format a buffer with a list of the active transports. A zero for
- * the buflen parameter disables target buffer overflow checking.
+static int svc_one_xprt_name(const struct svc_xprt *xprt,
+ char *pos, int remaining)
+{
+ int len;
+
+ len = snprintf(pos, remaining, "%s %u\n",
+ xprt->xpt_class->xcl_name,
+ svc_xprt_local_port(xprt));
+ if (len >= remaining)
+ return -ENAMETOOLONG;
+ return len;
+}
+
+/**
+ * svc_xprt_names - format a buffer with a list of transport names
+ * @serv: pointer to an RPC service
+ * @buf: pointer to a buffer to be filled in
+ * @buflen: length of buffer to be filled in
+ *
+ * Fills in @buf with a string containing a list of transport names,
+ * each name terminated with '\n'.
+ *
+ * Returns positive length of the filled-in string on success; otherwise
+ * a negative errno value is returned if an error occurs.
*/
-int svc_xprt_names(struct svc_serv *serv, char *buf, int buflen)
+int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen)
{
struct svc_xprt *xprt;
- char xprt_str[64];
- int totlen = 0;
- int len;
+ int len, totlen;
+ char *pos;
/* Sanity check args */
if (!serv)
return 0;
spin_lock_bh(&serv->sv_lock);
+
+ pos = buf;
+ totlen = 0;
list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
- len = snprintf(xprt_str, sizeof(xprt_str),
- "%s %d\n", xprt->xpt_class->xcl_name,
- svc_xprt_local_port(xprt));
- /* If the string was truncated, replace with error string */
- if (len >= sizeof(xprt_str))
- strcpy(xprt_str, "name-too-long\n");
- /* Don't overflow buffer */
- len = strlen(xprt_str);
- if (buflen && (len + totlen >= buflen))
+ len = svc_one_xprt_name(xprt, pos, buflen - totlen);
+ if (len < 0) {
+ *buf = '\0';
+ totlen = len;
+ }
+ if (len <= 0)
break;
- strcpy(buf+totlen, xprt_str);
+
+ pos += len;
totlen += len;
}
+
spin_unlock_bh(&serv->sv_lock);
return totlen;
}