linux-kernel - [PATCH 4.9 46/77] scsi: storvsc: fix memory leak on ring buffer busy

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Date:   Sun, 24 Sep 2017 22:32:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Long Li <longli@...rosoft.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.9 46/77] scsi: storvsc: fix memory leak on ring buffer busy

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Long Li <longli@...rosoft.com>

commit 0208eeaa650c5c866a3242201678a19e6dc4a14e upstream.

When storvsc is sending I/O to Hyper-v, it may allocate a bigger buffer
descriptor for large data payload that can't fit into a pre-allocated
buffer descriptor. This bigger buffer is freed on return path.

If I/O request to Hyper-v fails due to ring buffer busy, the storvsc
allocated buffer descriptor should also be freed.

[mkp: applied by hand]

Fixes: be0cf6ca301c ("scsi: storvsc: Set the tablesize based on the information given by the host")
Signed-off-by: Long Li <longli@...rosoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/storvsc_drv.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1559,6 +1559,8 @@ static int storvsc_queuecommand(struct S
 	ret = storvsc_do_io(dev, cmd_request);

 	if (ret == -EAGAIN) {
+		if (payload_sz > sizeof(cmd_request->mpb))
+			kfree(payload);
 		/* no more space */
 		return SCSI_MLQUEUE_DEVICE_BUSY;
 	}