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authorAndrea Parri (Microsoft) <parri.andrea@gmail.com>2020-11-18 15:53:48 +0100
committerMartin K. Petersen <martin.petersen@oracle.com>2020-11-30 23:24:10 -0500
commit3b8c72d076c42bf27284cda7b2b2b522810686f8 (patch)
treebb198bd29de7e3aa2337dc821a755139bb8f4c93
parent6112ff4e8f393e7e297dff04eff0987f94d37fa1 (diff)
scsi: storvsc: Validate length of incoming packet in storvsc_on_channel_callback()
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@gmail.com Cc: "James E.J. Bottomley" <jejb@linux.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: linux-scsi@vger.kernel.org Reported-by: Saruhan Karademir <skarade@microsoft.com> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
-rw-r--r--drivers/scsi/storvsc_drv.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index ded00a89bfc4..99c8ff81de74 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1246,6 +1246,11 @@ 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,