[PATCH 5.10 064/104] hv_netvsc: Reset the RSC count if NVSP_STAT_FAIL in netvsc_receive()

[Greg Kroah-Hartman]

From: Andrea Parri (Microsoft) <parri.andrea@xxxxxxxxx>

[ Upstream commit 12bc8dfb83b5292fe387b795210018b7632ee08b ]

Commit 44144185951a0f ("hv_netvsc: Add validation for untrusted Hyper-V
values") added validation to rndis_filter_receive_data() (and
rndis_filter_receive()) which introduced NVSP_STAT_FAIL-scenarios where
the count is not updated/reset.  Fix this omission, and prevent similar
scenarios from occurring in the future.

Reported-by: Juan Vazquez <juvazq@xxxxxxxxxxxxx>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@xxxxxxxxx>
Fixes: 44144185951a0f ("hv_netvsc: Add validation for untrusted Hyper-V values")
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210203113602.558916-1-parri.andrea@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/hyperv/netvsc.c       | 5 ++++-
 drivers/net/hyperv/rndis_filter.c | 2 --
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 0c3de94b51787..6a7ab930ef70d 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1253,8 +1253,11 @@ static int netvsc_receive(struct net_device *ndev,
 		ret = rndis_filter_receive(ndev, net_device,
 					   nvchan, data, buflen);
 
-		if (unlikely(ret != NVSP_STAT_SUCCESS))
+		if (unlikely(ret != NVSP_STAT_SUCCESS)) {
+			/* Drop incomplete packet */
+			nvchan->rsc.cnt = 0;
 			status = NVSP_STAT_FAIL;
+		}
 	}
 
 	enq_receive_complete(ndev, net_device, q_idx,
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index b22e47bcfeca1..90bc0008fa2fd 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -508,8 +508,6 @@ static int rndis_filter_receive_data(struct net_device *ndev,
 	return ret;
 
 drop:
-	/* Drop incomplete packet */
-	nvchan->rsc.cnt = 0;
 	return NVSP_STAT_FAIL;
 }
 
-- 
2.27.0