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authorTrond Myklebust <Trond.Myklebust@netapp.com>2010-10-23 14:53:23 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-10-23 15:27:38 -0400
commit4a201d6e3f4253f918555cc7c27c418f8ac1bb65 (patch)
tree9424a999b43f8c4d397f513a32258a64f3bed61a
parent82f2e5472e2304e531c2fa85e457f4a71070044e (diff)
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NFS: Ensure we check all allocation return values in new readdir code
Also some clean ups. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/dir.c61
1 files changed, 37 insertions, 24 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 2a768d05a53..257e4052492 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -225,33 +225,42 @@ int nfs_readdir_clear_array(struct page *page, gfp_t mask)
* nfs_clear_readdir_array()
*/
static
-void nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
+int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
{
string->len = len;
string->name = kmemdup(name, len, GFP_KERNEL);
- string->hash = full_name_hash(string->name, string->len);
+ if (string->name == NULL)
+ return -ENOMEM;
+ string->hash = full_name_hash(name, len);
+ return 0;
}
static
int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
{
struct nfs_cache_array *array = nfs_readdir_get_array(page);
+ struct nfs_cache_array_entry *cache_entry;
+ int ret;
+
if (IS_ERR(array))
return PTR_ERR(array);
- if (array->size >= MAX_READDIR_ARRAY) {
- nfs_readdir_release_array(page);
- return -EIO;
- }
+ ret = -EIO;
+ if (array->size >= MAX_READDIR_ARRAY)
+ goto out;
- array->array[array->size].cookie = entry->prev_cookie;
+ 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);
+ if (ret)
+ goto out;
array->last_cookie = entry->cookie;
- array->array[array->size].ino = entry->ino;
- nfs_readdir_make_qstr(&array->array[array->size].string, entry->name, entry->len);
if (entry->eof == 1)
array->eof_index = array->size;
array->size++;
+out:
nfs_readdir_release_array(page);
- return 0;
+ return ret;
}
static
@@ -388,21 +397,24 @@ different:
static
void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
{
- struct qstr filename;
- struct dentry *dentry = NULL;
- struct dentry *alias = NULL;
+ struct qstr filename = {
+ .len = entry->len,
+ .name = entry->name,
+ };
+ struct dentry *dentry;
+ struct dentry *alias;
struct inode *dir = parent->d_inode;
struct inode *inode;
- nfs_readdir_make_qstr(&filename, entry->name, entry->len);
- if (filename.len == 1 && filename.name[0] == '.')
- dentry = dget(parent);
- else if (filename.len == 2 && filename.name[0] == '.'
- && filename.name[1] == '.')
- dentry = dget_parent(parent);
- else
- dentry = d_lookup(parent, &filename);
+ if (filename.name[0] == '.') {
+ if (filename.len == 1)
+ return;
+ if (filename.len == 2 && filename.name[1] == '.')
+ return;
+ }
+ filename.hash = full_name_hash(filename.name, filename.len);
+ dentry = d_lookup(parent, &filename);
if (dentry != NULL) {
if (nfs_same_file(dentry, entry)) {
nfs_refresh_inode(dentry->d_inode, entry->fattr);
@@ -414,6 +426,9 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
}
dentry = d_alloc(parent, &filename);
+ if (dentry == NULL)
+ return;
+
dentry->d_op = NFS_PROTO(dir)->dentry_ops;
inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr);
if (IS_ERR(inode))
@@ -430,8 +445,6 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
out:
dput(dentry);
- kfree(filename.name);
- return;
}
/* Perform conversion from xdr to cache array */
@@ -508,7 +521,7 @@ void *nfs_readdir_large_page(struct page **pages, unsigned int npages)
pages[i] = page;
}
- ptr = vm_map_ram(pages, NFS_MAX_READDIR_PAGES, 0, PAGE_KERNEL);
+ ptr = vm_map_ram(pages, npages, 0, PAGE_KERNEL);
if (!IS_ERR_OR_NULL(ptr))
return ptr;
out_freepages: