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 4.9-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-4.9 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
@@ -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;
}
Patches currently in stable-queue which might be from longli@xxxxxxxxxxxxx are
queue-4.9/scsi-storvsc-fix-memory-leak-on-ring-buffer-busy.patch