net: sunrpc: interpret the return value of kstrtou32 correctly

commit 86b53fbf08f48d353a86a06aef537e78e82ba721 upstream.

A return value of 0 means success. This is documented in lib/kstrtox.c.

This was found by trying to mount an NFS share from a link-local IPv6
address with the interface specified by its index:

  mount("[fe80::1%1]:/srv/nfs", "/mnt", "nfs", 0, "nolock,addr=fe80::1%1")

Before this commit this failed with EINVAL and also caused the following
message in dmesg:

  [...] NFS: bad IP address specified: addr=fe80::1%1

The syscall using the same address based on the interface name instead
of its index succeeds.

Credits for this patch go to my colleague Christian Speich, who traced
the origin of this bug to this line of code.

Signed-off-by: Johannes Nixdorf <j.nixdorf@avm.de>
Fixes: 00cfaa943ec3 ("replace strict_strto calls")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sunrpc/addr.c b/net/sunrpc/addr.c
index 105d17af4abcc6897625ed0eceb22b03cf746200..0d4a2bb09589c889d8179c231740b2cf39c6a1f1 100644 (file)
--- a/net/sunrpc/addr.c
+++ b/net/sunrpc/addr.c
@@ -185,7 +185,7 @@ static int rpc_parse_scope_id(struct net *net, const char *buf,
                        scope_id = dev->ifindex;
                        dev_put(dev);
                } else {
-                       if (kstrtou32(p, 10, &scope_id) == 0) {
+                       if (kstrtou32(p, 10, &scope_id) != 0) {
                                kfree(p);
                                return 0;
                        }