NFS: Fix misparsing of nfsv4 fs_locations attribute (take 2)

The changeset ea31a4437c59219bf3ea946d58984b01a45a289c (nfs: Fix
misparsing of nfsv4 fs_locations attribute) causes the mountpath that is
calculated at the beginning of try_location() to be clobbered when we
later strncpy a non-nul terminated hostname using an incorrect buffer
length.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index 30befc39b3c6..2a2a0a7143ad 100644
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -21,7 +21,9 @@
 #define NFSDBG_FACILITY         NFSDBG_VFS
 
 /*
- * Check if fs_root is valid
+ * Convert the NFSv4 pathname components into a standard posix path.
+ *
+ * Note that the resulting string will be placed at the end of the buffer
  */
 static inline char *nfs4_pathname_string(const struct nfs4_pathname *pathname,
                                          char *buffer, ssize_t buflen)
@@ -99,21 +101,20 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
 {
         struct vfsmount *mnt = ERR_PTR(-ENOENT);
         char *mnt_path;
-        int page2len;
+        unsigned int maxbuflen;
         unsigned int s;
 
         mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
         if (IS_ERR(mnt_path))
                 return mnt;
         mountdata->mnt_path = mnt_path;
-        page2 += strlen(mnt_path) + 1;
-        page2len = PAGE_SIZE - strlen(mnt_path) - 1;
+        maxbuflen = mnt_path - 1 - page2;
 
         for (s = 0; s < location->nservers; s++) {
                 const struct nfs4_string *buf = &location->servers[s];
                 struct sockaddr_storage addr;
 
-                if (buf->len <= 0 || buf->len >= PAGE_SIZE)
+                if (buf->len <= 0 || buf->len >= maxbuflen)
                         continue;
 
                 mountdata->addr = (struct sockaddr *)&addr;
@@ -126,8 +127,8 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
                         continue;
                 nfs_set_port(mountdata->addr, NFS_PORT);
 
-                strncpy(page2, buf->data, page2len);
-                page2[page2len] = '\0';
+                memcpy(page2, buf->data, buf->len);
+                page2[buf->len] = '\0';
                 mountdata->hostname = page2;
 
                 snprintf(page, PAGE_SIZE, "%s:%s",