From: Jan Kara jack@suse.cz
commit 66d8fc0539b0d49941f313c9509a8384e4245ac1 upstream.
The @source inode must be valid. It is even checked via IS_SWAPFILE() above making it pretty clear. So no need to check it when we unlock.
What doesn't need to exist is the @target inode. The lock_two_inodes() helper currently swaps the @inode1 and @inode2 arguments if @inode1 is NULL to have consistent lock class usage. However, we know that at least for vfs_rename() that @inode1 is @source and thus is never NULL as per above. We also know that @source is a different inode than @target as that is checked right at the beginning of vfs_rename(). So we know that @source is valid and locked and that @target is locked. So drop the check whether @source is non-NULL.
Fixes: 28eceeda130f ("fs: Lock moved directories") Reported-by: kernel test robot lkp@intel.com Reported-by: Dan Carpenter dan.carpenter@linaro.org Closes: https://lore.kernel.org/r/202307030026.9sE2pk2x-lkp@intel.com Message-Id: 20230703-vfs-rename-source-v1-1-37eebb29b65b@kernel.org [brauner: use commit message from patch I sent concurrently] Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/namei.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/fs/namei.c +++ b/fs/namei.c @@ -4497,8 +4497,7 @@ int vfs_rename(struct inode *old_dir, st d_exchange(old_dentry, new_dentry); } out: - if (source) - inode_unlock(source); + inode_unlock(source); if (target) inode_unlock(target); dput(new_dentry);