This is a note to let you know that I've just added the patch titled scsi: storvsc: fix memory leak on ring buffer busy to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: scsi-storvsc-fix-memory-leak-on-ring-buffer-busy.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 0208eeaa650c5c866a3242201678a19e6dc4a14e Mon Sep 17 00:00:00 2001 From: Long Li <longli@xxxxxxxxxxxxx> Date: Mon, 28 Aug 2017 17:43:59 -0700 Subject: scsi: storvsc: fix memory leak on ring buffer busy From: Long Li <longli@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/scsi/storvsc_drv.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -1511,6 +1511,8 @@ 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; } Patches currently in stable-queue which might be from longli@xxxxxxxxxxxxx are queue-4.4/scsi-storvsc-fix-memory-leak-on-ring-buffer-busy.patch