Commit 5dc64164 authored by Dan Rosenberg's avatar Dan Rosenberg Committed by Chris Mason
Browse files

Btrfs: check for read permission on src file in the clone ioctl



The existing code would have allowed you to clone a file that was
only open for writing
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 9f680ce0
......@@ -1480,12 +1480,17 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
ret = -EBADF;
goto out_drop_write;
}
src = src_file->f_dentry->d_inode;
ret = -EINVAL;
if (src == inode)
goto out_fput;
/* the src must be open for reading */
if (!(src_file->f_mode & FMODE_READ))
goto out_fput;
ret = -EISDIR;
if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
goto out_fput;
......
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