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cifs: fix leaked reference on requeued write
commit a481379 upstream. Failed async writes that are requeued may not clean up a refcount on the file, which can result in a leaked open. This scenario arises very reliably when using persistent handles and a reconnect occurs while writing. cifs_writev_requeue only releases the reference if the write fails (rc != 0). The server->ops->async_writev operation will take its own reference, so the initial reference can always be released. Signed-off-by: Adam McCoy <adam@forsedomani.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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