NFS: Fix a few constant_table array definitions

nfs_vers_tokens, nfs_xprt_protocol_tokens, and nfs_secflavor_tokens were
all missing an empty item at the end of the array, allowing
lookup_constant() to potentially walk off the end and trigger and oops.

Reported-by: Olga Kornievskaia <aglo@umich.edu>
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Fixes: e38bb238ed8c ("NFS: Convert mount option parsing to use functionality from fs_parser.h")
Cc: stable@vger.kernel.org # v5.6
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index 566dd59..ccc88be 100644 (file)
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -190,6 +190,7 @@ static const struct constant_table nfs_vers_tokens[] = {
        { "4.0",        Opt_vers_4_0 },
        { "4.1",        Opt_vers_4_1 },
        { "4.2",        Opt_vers_4_2 },
+       {}
 };
 
 enum {
@@ -202,13 +203,14 @@ enum {
        nr__Opt_xprt
 };
 
-static const struct constant_table nfs_xprt_protocol_tokens[nr__Opt_xprt] = {
+static const struct constant_table nfs_xprt_protocol_tokens[] = {
        { "rdma",       Opt_xprt_rdma },
        { "rdma6",      Opt_xprt_rdma6 },
        { "tcp",        Opt_xprt_tcp },
        { "tcp6",       Opt_xprt_tcp6 },
        { "udp",        Opt_xprt_udp },
        { "udp6",       Opt_xprt_udp6 },
+       {}
 };
 
 enum {
@@ -239,6 +241,7 @@ static const struct constant_table nfs_secflavor_tokens[] = {
        { "spkm3i",     Opt_sec_spkmi },
        { "spkm3p",     Opt_sec_spkmp },
        { "sys",        Opt_sec_sys },
+       {}
 };
 
 /*