linux-kernel - [PATCH AUTOSEL 5.16 17/19] vdpa/mlx5: Fix is_index

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Date:   Sat, 22 Jan 2022 19:11:10 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Eli Cohen <elic@...dia.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Jason Wang <jasowang@...hat.com>,
        Sasha Levin <sashal@...nel.org>, parav@...dia.com,
        xieyongji@...edance.com, virtualization@...ts.linux-foundation.org
Subject: [PATCH AUTOSEL 5.16 17/19] vdpa/mlx5: Fix is_index_valid() to refer to features

From: Eli Cohen <elic@...dia.com>

[ Upstream commit f8ae3a489b21b05c39a0a1a7734f2a0188852177 ]

Make sure the decision whether an index received through a callback is
valid or not consults the negotiated features.

The motivation for this was due to a case encountered where I shut down
the VM. After the reset operation was called features were already
clear, I got get_vq_state() call which caused out array bounds
access since is_index_valid() reported the index value.

So this is more of not hit a bug since the call shouldn't have been made
first place.

Signed-off-by: Eli Cohen <elic@...dia.com>
Link: https://lore.kernel.org/r/20220111183400.38418-4-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Reviewed-by: Si-Wei Liu<si-wei.liu@...cle.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index d8e69340a25ae..68ace0ad659f2 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -138,10 +138,14 @@ struct mlx5_vdpa_virtqueue {
 
 static bool is_index_valid(struct mlx5_vdpa_dev *mvdev, u16 idx)
 {
-	if (unlikely(idx > mvdev->max_idx))
-		return false;
+	if (!(mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_MQ))) {
+		if (!(mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)))
+			return idx < 2;
+		else
+			return idx < 3;
+	}
 
-	return true;
+	return idx <= mvdev->max_idx;
 }
 
 struct mlx5_vdpa_net {
-- 
2.34.1