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commit 70779b897395b330ba5a47bed84f94178da599f9 upstream. The reference count of the old buffer head should be decremented on path that fails to get the new buffer head. Fixes: 6b4657667ba0 ("fs/affs: add rename exchange") CC: stable@vger.kernel.org # 4.14+ Signed-off-by: Pan Bian <bianpan2016@163.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>