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scsi: storvsc: fix memory leak on ring buffer busy 

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: be0cf6ca30 ("scsi: storvsc: Set the tablesize based on the information given by the host")
Cc: <stable@vger.kernel.org>
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Long Li 2017-08-28 17:43:59 -07:00 committed by Martin K. Petersen
parent 1ae948fa4f
commit 0208eeaa65
1 changed files with 2 additions and 0 deletions
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2
drivers/scsi/storvsc_drv.c
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@ -1640,6 +1640,8 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
put_cpu();
if (ret == -EAGAIN) {
if (payload_sz > sizeof(cmd_request->mpb))
kfree(payload);
/* no more space */
return SCSI_MLQUEUE_DEVICE_BUSY;
}