[PATCH 4.20 17/57] cifs: check kzalloc return

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Perches <j...@perches.com>

commit 0544b324e62c177c3a9e9c3bdce22e6db9f34588 upstream.

kzalloc can return NULL so an additional check is needed. While there
is a check for ret_buf there is no check for the allocation of
ret_buf->crfid.fid - this check is thus added. Both call-sites
of tconInfoAlloc() check for NULL return of tconInfoAlloc()
so returning NULL on failure of kzalloc() here seems appropriate.
As the kzalloc() is the only thing here that can fail it is
moved to the beginning so as not to initialize other resources
on failure of kzalloc.

Fixes: 3d4ef9a15343 ("smb3: fix redundant opens on root")

Signed-off-by: Joe Perches <j...@perches.com>
Signed-off-by: Steve French <stfre...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/cifs/misc.c |   34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -111,21 +111,27 @@ struct cifs_tcon *
 tconInfoAlloc(void)
 {
        struct cifs_tcon *ret_buf;
-       ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
-       if (ret_buf) {
-               atomic_inc(&tconInfoAllocCount);
-               ret_buf->tidStatus = CifsNew;
-               ++ret_buf->tc_count;
-               INIT_LIST_HEAD(&ret_buf->openFileList);
-               INIT_LIST_HEAD(&ret_buf->tcon_list);
-               spin_lock_init(&ret_buf->open_file_lock);
-               mutex_init(&ret_buf->crfid.fid_mutex);
-               ret_buf->crfid.fid = kzalloc(sizeof(struct cifs_fid),
-                                            GFP_KERNEL);
-               spin_lock_init(&ret_buf->stat_lock);
-               atomic_set(&ret_buf->num_local_opens, 0);
-               atomic_set(&ret_buf->num_remote_opens, 0);
+
+       ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL);
+       if (!ret_buf)
+               return NULL;
+       ret_buf->crfid.fid = kzalloc(sizeof(*ret_buf->crfid.fid), GFP_KERNEL);
+       if (!ret_buf->crfid.fid) {
+               kfree(ret_buf);
+               return NULL;
        }
+
+       atomic_inc(&tconInfoAllocCount);
+       ret_buf->tidStatus = CifsNew;
+       ++ret_buf->tc_count;
+       INIT_LIST_HEAD(&ret_buf->openFileList);
+       INIT_LIST_HEAD(&ret_buf->tcon_list);
+       spin_lock_init(&ret_buf->open_file_lock);
+       mutex_init(&ret_buf->crfid.fid_mutex);
+       spin_lock_init(&ret_buf->stat_lock);
+       atomic_set(&ret_buf->num_local_opens, 0);
+       atomic_set(&ret_buf->num_remote_opens, 0);
+
        return ret_buf;
 }