SUNRPC: Fix infinite looping in rpc_clnt_iterate_for_each_xprt

If there were less than 2 entries in the multipath list, then
xprt_iter_next_entry_multiple() would never advance beyond the
first entry, which is correct for round robin behaviour, but not
for the list iteration.

The end result would be infinite looping in rpc_clnt_iterate_for_each_xprt()
as we would never see the xprt == NULL condition fulfilled.

Reported-by: Oleg Drokin <green@linuxhacker.ru>
Fixes: 80b14d5e61ca ("SUNRPC: Add a structure to track multiple transports")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/net/sunrpc/xprtmultipath.c b/net/sunrpc/xprtmultipath.c
index e7fd76975d86..66c9d63f4797 100644
--- a/net/sunrpc/xprtmultipath.c
+++ b/net/sunrpc/xprtmultipath.c
@@ -271,14 +271,12 @@ struct rpc_xprt *xprt_iter_next_entry_multiple(struct rpc_xprt_iter *xpi,
                 xprt_switch_find_xprt_t find_next)
 {
         struct rpc_xprt_switch *xps = rcu_dereference(xpi->xpi_xpswitch);
-        struct list_head *head;
 
         if (xps == NULL)
                 return NULL;
-        head = &xps->xps_xprt_list;
-        if (xps->xps_nxprts < 2)
-                return xprt_switch_find_first_entry(head);
-        return xprt_switch_set_next_cursor(head, &xpi->xpi_cursor, find_next);
+        return xprt_switch_set_next_cursor(&xps->xps_xprt_list,
+                        &xpi->xpi_cursor,
+                        find_next);
 }
 
 static