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[82.51.6.75]) by smtp.gmail.com with ESMTPSA id v19sm4394146wmj.31.2020.11.18.07.33.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Nov 2020 07:33:26 -0800 (PST) From: "Andrea Parri (Microsoft)" To: linux-kernel@vger.kernel.org Cc: "K . Y . Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , linux-hyperv@vger.kernel.org, Michael Kelley , Juan Vazquez , Saruhan Karademir , "Andrea Parri (Microsoft)" , "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org Subject: [PATCH] hv_netvsc: Validate number of allocated sub-channels Date: Wed, 18 Nov 2020 16:33:10 +0100 Message-Id: <20201118153310.112404-1-parri.andrea@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 Signed-off-by: Andrea Parri (Microsoft) Cc: "David S. Miller" Cc: Jakub Kicinski Cc: netdev@vger.kernel.org Reviewed-by: Haiyang Zhang Acked-by: Jakub Kicinski --- 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;