From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerlando Falauto Subject: [PATCH 1/2] net/fsl_pq_mdio: check TBI address for consistency with mapped range Date: Fri, 9 Oct 2015 17:15:07 +0200 Message-ID: <1444403708-16576-1-git-send-email-gerlando.falauto@keymile.com> References: <1371041258-15298-1-git-send-email-ogabbay@advaoptical.com> Cc: ogabbay@advaoptical.com, bigeasy@linutronix.de, Gerlando Falauto , Timur Tabi , "David S. Miller" , Andy Fleming , Kumar Gala To: netdev@vger.kernel.org, timur@tabi.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1371041258-15298-1-git-send-email-ogabbay@advaoptical.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org When configuring the MDIO subsystem it is also necessary to configure the TBI register. Make sure the TBI is contained within the mapped register range in order to: a) make sure the address is computed correctly b) make users aware that we're actually accessing that register In case of error, print a message but continue anyway. Change-Id: If1e7d8931f440ea9259726c36d3df797dda016fb Signed-off-by: Gerlando Falauto Cc: Timur Tabi Cc: David S. Miller Cc: Andy Fleming Cc: Kumar Gala --- drivers/net/ethernet/freescale/fsl_pq_mdio.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/net/ethernet/freescale/fsl_pq_mdio.c b/drivers/net/ethernet/freescale/fsl_pq_mdio.c index 3c40f6b..4618011 100644 --- a/drivers/net/ethernet/freescale/fsl_pq_mdio.c +++ b/drivers/net/ethernet/freescale/fsl_pq_mdio.c @@ -445,6 +445,16 @@ static int fsl_pq_mdio_probe(struct platform_device *pdev) tbipa = data->get_tbipa(priv->map); + /* + * Add consistency check to make sure TBI is contained + * within the mapped range (not because we would get a + * segfault, rather to catch bugs in computing TBI + * address). Print error message but continue anyway. + */ + if (tbipa > priv->map + resource_size(&res)) + dev_err(&pdev->dev, "invalid register map (should be at least 0x%04x to contain TBI address)\n", + ((void *)tbipa - priv->map) + 4); + iowrite32be(be32_to_cpup(prop), tbipa); } } -- 1.8.0.1