linux-kernel - [PATCH] storvsc: fix memory leak on ring buffer busy

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Message-Id: <20170829004359.28526-1-longli@exchange.microsoft.com>
Date:   Mon, 28 Aug 2017 17:43:59 -0700
From:   Long Li <longli@...hange.microsoft.com>
To:     "K . Y . Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "James E . J . Bottomley" <JBottomley@...n.com>,
        devel@...uxdriverproject.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Long Li <longli@...rosoft.com>
Subject: [PATCH] storvsc: fix memory leak on ring buffer busy

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

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.

Signed-off-by: Long Li <longli@...rosoft.com>
---
 drivers/scsi/storvsc_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 009adb0..db52882 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1657,6 +1657,8 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 	ret = storvsc_do_io(dev, cmd_request, smp_processor_id());
 
 	if (ret == -EAGAIN) {
+		if (payload_sz > sizeof(cmd_request->mpb))
+			kfree(payload);
 		/* no more space */
 		return SCSI_MLQUEUE_DEVICE_BUSY;
 	}
-- 
2.7.4