NFS: Correct the array bound calculation in nfs_readdir_add_to_array

It looks as if the array size calculation in MAX_READDIR_ARRAY does not
take the alignment of struct nfs_cache_array_entry into account.

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

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index ddc2e439702b..ced7291cc5f8 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -171,8 +171,6 @@ struct nfs_cache_array {
         struct nfs_cache_array_entry array[0];
 };
 
-#define MAX_READDIR_ARRAY ((PAGE_SIZE - sizeof(struct nfs_cache_array)) / sizeof(struct nfs_cache_array_entry))
-
 typedef __be32 * (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
 typedef struct {
         struct file     *file;
@@ -257,11 +255,14 @@ int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
 
         if (IS_ERR(array))
                 return PTR_ERR(array);
+
+        cache_entry = &array->array[array->size];
+
+        /* Check that this entry lies within the page bounds */
         ret = -ENOSPC;
-        if (array->size >= MAX_READDIR_ARRAY)
+        if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE)
                 goto out;
 
-        cache_entry = &array->array[array->size];
         cache_entry->cookie = entry->prev_cookie;
         cache_entry->ino = entry->ino;
         ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);