[PATCH AUTOSEL 4.14 6/8] scsi: storvsc: Validate length of incoming packet in storvsc_on_channel_callback()
From: Sasha Levin
Date: Sat Dec 12 2020 - 11:13:38 EST
From: "Andrea Parri (Microsoft)" <parri.andrea@xxxxxxxxx>
[ Upstream commit 3b8c72d076c42bf27284cda7b2b2b522810686f8 ]
Check that the packet is of the expected size at least, don't copy data
past the packet.
Link: https://lore.kernel.org/r/20201118145348.109879-1-parri.andrea@xxxxxxxxx
Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxx>
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Cc: linux-scsi@xxxxxxxxxxxxxxx
Reported-by: Saruhan Karademir <skarade@xxxxxxxxxxxxx>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@xxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/scsi/storvsc_drv.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 5adeb1e4b1869..2e0d8566dedba 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1179,6 +1179,11 @@ 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,
--
2.27.0