NSM: Use sockaddr_storage for sm_addr field

To store larger addresses in the nsm_handle structure, make sm_addr a
sockaddr_storage.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

3 files changed, 16 insertions, 4 deletions

diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 3ce2702d0368..510ebcf485f0 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -551,7 +551,7 @@ retry:
                         if (strlen(pos->sm_name) != hostname_len
                          || memcmp(pos->sm_name, hostname, hostname_len))
                                 continue;
-                } else if (!nlm_cmp_addr(&pos->sm_addr, sin))
+                } else if (!nlm_cmp_addr(nsm_addr_in(pos), sin))
                         continue;
                 atomic_inc(&pos->sm_count);
                 kfree(nsm);
@@ -571,7 +571,8 @@ retry:
         if (nsm == NULL)
                 return NULL;
 
-        nsm->sm_addr = *sin;
+        memcpy(nsm_addr(nsm), sin, sizeof(*sin));
+        nsm->sm_addrlen = sizeof(*sin);
         nsm->sm_name = (char *) (nsm + 1);
         memcpy(nsm->sm_name, hostname, hostname_len);
         nsm->sm_name[hostname_len] = '\0';
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index e4d563543b11..4e7e958e8f67 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -51,7 +51,7 @@ nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
 
         memset(&args, 0, sizeof(args));
         args.mon_name = nsm->sm_name;
-        args.addr = nsm->sm_addr.sin_addr.s_addr;
+        args.addr = nsm_addr_in(nsm)->sin_addr.s_addr;
         args.prog = NLM_PROGRAM;
         args.vers = 3;
         args.proc = NLMPROC_NSM_NOTIFY;
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 964e6c93830f..b1dfa0b1d1bc 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -71,7 +71,8 @@ struct nsm_handle {
         struct list_head        sm_link;
         atomic_t                sm_count;
         char *                  sm_name;
-        struct sockaddr_in      sm_addr;
+        struct sockaddr_storage sm_addr;
+        size_t                  sm_addrlen;
         unsigned int            sm_monitored : 1,
                                 sm_sticky : 1;  /* don't unmonitor */
         char                    sm_addrbuf[48]; /* address eyecatcher */
@@ -100,6 +101,16 @@ static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
         return (struct sockaddr *)&host->h_srcaddr;
 }
 
+static inline struct sockaddr_in *nsm_addr_in(const struct nsm_handle *handle)
+{
+        return (struct sockaddr_in *)&handle->sm_addr;
+}
+
+static inline struct sockaddr *nsm_addr(const struct nsm_handle *handle)
+{
+        return (struct sockaddr *)&handle->sm_addr;
+}
+
 /*
  * Map an fl_owner_t into a unique 32-bit "pid"
  */