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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>
This commit is contained in:
Trond Myklebust 2010-11-20 15:18:22 -05:00
parent ece0b4233b
commit 3020093f57
1 changed files with 6 additions and 5 deletions
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11
fs/nfs/dir.c
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@ -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);
ret = -ENOSPC;
if (array->size >= MAX_READDIR_ARRAY)
goto out;
cache_entry = &array->array[array->size];
/* Check that this entry lies within the page bounds */
ret = -ENOSPC;
if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE)
goto out;
cache_entry->cookie = entry->prev_cookie;
cache_entry->ino = entry->ino;
ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);