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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-11-20 20:18:22 (GMT) |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-11-22 18:24:47 (GMT) |
| commit | 3020093f578fb6c9acc6914dfd887a1ebd1db659 (patch) | |
| tree | 473af4f139dcb3975b20bcd9d2e04fb1cadc97b3 | |
| parent | ece0b4233b6b915d1f63add2bd9f2733aec6317a (diff) | |
| download | linux-fsl-qoriq-3020093f578fb6c9acc6914dfd887a1ebd1db659.tar.xz | |
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>
| -rw-r--r-- | fs/nfs/dir.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index ddc2e43..ced7291 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); |