From: "Andrea Parri (Microsoft)" <parri.andrea@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: "K . Y . Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>,
linux-hyperv@vger.kernel.org,
Michael Kelley <mikelley@microsoft.com>,
Juan Vazquez <juvazq@microsoft.com>,
Saruhan Karademir <skarade@microsoft.com>,
"Andrea Parri (Microsoft)" <parri.andrea@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org
Subject: [PATCH] hv_netvsc: Validate number of allocated sub-channels
Date: Wed, 18 Nov 2020 16:33:10 +0100 [thread overview]
Message-ID: <20201118153310.112404-1-parri.andrea@gmail.com> (raw)
Lack of validation could lead to out-of-bound reads and information
leaks (cf. usage of nvdev->chan_table[]). Check that the number of
allocated sub-channels fits into the expected range.
Suggested-by: Saruhan Karademir <skarade@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
---
Based on hyperv-next.
drivers/net/hyperv/rndis_filter.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 3835d9bea1005..c5a709f67870f 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1226,6 +1226,11 @@ int rndis_set_subchannel(struct net_device *ndev,
return -EIO;
}
+ /* Check that number of allocated sub channel is within the expected range */
+ if (init_packet->msg.v5_msg.subchn_comp.num_subchannels > nvdev->num_chn - 1) {
+ netdev_err(ndev, "invalid number of allocated sub channel\n");
+ return -EINVAL;
+ }
nvdev->num_chn = 1 +
init_packet->msg.v5_msg.subchn_comp.num_subchannels;
--
2.25.1
next reply other threads:[~2020-11-18 15:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-18 15:33 Andrea Parri (Microsoft) [this message]
2020-11-18 20:57 ` [PATCH] hv_netvsc: Validate number of allocated sub-channels Haiyang Zhang
2020-11-19 1:37 ` Jakub Kicinski
2020-11-24 16:22 ` Wei Liu
2020-12-13 21:31 ` Michael Kelley
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