From: "Andrea Parri (Microsoft)" <parri.andrea@gmail.com>
To: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Cc: "K . Y . Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
"Andrea Parri (Microsoft)" <parri.andrea@gmail.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org
Subject: [PATCH] Revert "scsi: storvsc: Validate length of incoming packet in storvsc_on_channel_callback()"
Date: Fri, 11 Dec 2020 14:14:04 +0100 [thread overview]
Message-ID: <20201211131404.21359-1-parri.andrea@gmail.com> (raw)
This reverts commit 3b8c72d076c42bf27284cda7b2b2b522810686f8.
Dexuan reported a regression where StorVSC fails to probe a device (and
where, consequently, the VM may fail to boot). The root-cause analysis
led to a long-standing race condition that is exposed by the validation
/commit in question. Let's put the new validation aside until a proper
solution for that race condition is in place.
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
---
drivers/scsi/storvsc_drv.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 99c8ff81de746..ded00a89bfc4e 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1246,11 +1246,6 @@ static void storvsc_on_channel_callback(void *context)
request = (struct storvsc_cmd_request *)
((unsigned long)desc->trans_id);
- if (hv_pkt_datalen(desc) < sizeof(struct vstor_packet) - vmscsi_size_delta) {
- dev_err(&device->device, "Invalid packet len\n");
- continue;
- }
-
if (request == &stor_device->init_request ||
request == &stor_device->reset_request) {
memcpy(&request->vstor_packet, packet,
--
2.25.1
next reply other threads:[~2020-12-11 13:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-11 13:14 Andrea Parri (Microsoft) [this message]
2020-12-11 14:01 ` [PATCH] Revert "scsi: storvsc: Validate length of incoming packet in storvsc_on_channel_callback()" Wei Liu
2020-12-11 14:59 ` Martin K. Petersen
2020-12-11 17:19 ` Wei Liu
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