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
