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authorAndrea Parri (Microsoft) <parri.andrea@gmail.com>2020-12-11 16:14:04 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2020-12-11 17:56:17 +0300
commit4da3a54f5a025846f9930354cfb80f075b9952e0 (patch)
tree8a38786ba8616f67f43b659c4a309545a3fa9d9a /drivers/scsi/storvsc_drv.c
parent359db63378eded1ee9c8c9ad72245f9b0158ae95 (diff)
downloadlinux-4da3a54f5a025846f9930354cfb80f075b9952e0.tar.xz
Revert "scsi: storvsc: Validate length of incoming packet in storvsc_on_channel_callback()"
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. Link: https://lore.kernel.org/r/20201211131404.21359-1-parri.andrea@gmail.com Fixes: 3b8c72d076c4 ("scsi: storvsc: Validate length of incoming packet in storvsc_on_channel_callback()") 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 Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/storvsc_drv.c')
-rw-r--r--drivers/scsi/storvsc_drv.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 99c8ff81de74..ded00a89bfc4 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,