1 files changed, 22 insertions, 7 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a506a22b522a..be2d4f6aaa5e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -203,7 +203,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 
 
         trans = btrfs_join_transaction(root, 1);
-        BUG_ON(!trans);
+        BUG_ON(IS_ERR(trans));
 
         ret = btrfs_update_inode(trans, root, inode);
         BUG_ON(ret);
@@ -907,6 +907,10 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
 
         if (new_size > old_size) {
                 trans = btrfs_start_transaction(root, 0);
+                if (IS_ERR(trans)) {
+                        ret = PTR_ERR(trans);
+                        goto out_unlock;
+                }
                 ret = btrfs_grow_device(trans, device, new_size);
                 btrfs_commit_transaction(trans, root);
         } else {
@@ -1898,7 +1902,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
 
                         memcpy(&new_key, &key, sizeof(new_key));
                         new_key.objectid = inode->i_ino;
-                        new_key.offset = key.offset + destoff - off;
+                        if (off <= key.offset)
+                                new_key.offset = key.offset + destoff - off;
+                        else
+                                new_key.offset = destoff;
 
                         trans = btrfs_start_transaction(root, 1);
                         if (IS_ERR(trans)) {
@@ -2082,7 +2089,7 @@ static long btrfs_ioctl_trans_start(struct file *file)
 
         ret = -ENOMEM;
         trans = btrfs_start_ioctl_transaction(root, 0);
-        if (!trans)
+        if (IS_ERR(trans))
                 goto out_drop;
 
         file->private_data = trans;
@@ -2138,9 +2145,9 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
         path->leave_spinning = 1;
 
         trans = btrfs_start_transaction(root, 1);
-        if (!trans) {
+        if (IS_ERR(trans)) {
                 btrfs_free_path(path);
-                return -ENOMEM;
+                return PTR_ERR(trans);
         }
 
         dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
@@ -2201,7 +2208,7 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
         int num_types = 4;
         int alloc_size;
         int ret = 0;
-        int slot_count = 0;
+        u64 slot_count = 0;
         int i, c;
 
         if (copy_from_user(&space_args,
@@ -2240,7 +2247,7 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
                 goto out;
         }
 
-        slot_count = min_t(int, space_args.space_slots, slot_count);
+        slot_count = min_t(u64, space_args.space_slots, slot_count);
 
         alloc_size = sizeof(*dest) * slot_count;
 
@@ -2260,6 +2267,9 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
         for (i = 0; i < num_types; i++) {
                 struct btrfs_space_info *tmp;
 
+                if (!slot_count)
+                        break;
+
                 info = NULL;
                 rcu_read_lock();
                 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
@@ -2281,7 +2291,10 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
                                 memcpy(dest, &space, sizeof(space));
                                 dest++;
                                 space_args.total_spaces++;
+                                slot_count--;
                         }
+                        if (!slot_count)
+                                break;
                 }
                 up_read(&info->groups_sem);
         }
@@ -2334,6 +2347,8 @@ static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp
         u64 transid;
 
         trans = btrfs_start_transaction(root, 0);
+        if (IS_ERR(trans))
+                return PTR_ERR(trans);
         transid = trans->transid;
         btrfs_commit_transaction_async(trans, root, 0);