Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752520AbcDRNyH (ORCPT ); Mon, 18 Apr 2016 09:54:07 -0400 Received: from mail1.bemta3.messagelabs.com ([195.245.230.176]:13876 "EHLO mail1.bemta3.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752089AbcDRNyE (ORCPT ); Mon, 18 Apr 2016 09:54:04 -0400 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrGIsWRWlGSWpSXmKPExsVyU6aHU/f7M5F wg4ZGNYvLu+awWRxbIObA5PF5k1wAYxRrZl5SfkUCa8ayh5vYC3a6V+xZcIS5gbHVpouRi0NI YAOjxNqDM1i6GDk52ATMJHa9WscOYosIyEgc7V/ABmIzC4RK3P45HcwWFoiSaP+8nBHEZhFQl XjTMw+sl1fAT2Lb0X1MXYwcHBICchILLqSDhDkF/CX+7T7PDhIWAirpPZAGUS0ocXLmExaI6R ISB1+8YAaxhQS0JZbv6QO7QEJAQWL2qg1MEHaKxK9j/xghbGuJtr8f2CcwCsxCMmoWklELGJl WMaoXpxaVpRbpGuslFWWmZ5TkJmbm6BoaGOvlphYXJ6an5iQmFesl5+duYgSGIQMQ7GBs/uJ0 iFGSg0lJlHfSKpFwIb6k/JTKjMTijPii0pzU4kOMMhwcShK8W54C5QSLUtNTK9Iyc4ARAZOW4 OBREuE9CZLmLS5IzC3OTIdInWLU5biw68FaJiGWvPy8VClx3k0gRQIgRRmleXAjYNF5iVFWSp iXEegoIZ6C1KLczBJU+VeM4hyMSsK850Cm8GTmlcBtegV0BBPQEdZvBEGOKElESEk1MMYLSt5 kuBzb3fW/i3dW8Il9gYWfn3m+5o07l9ulq3L2m136J3sO55WbPqk8k+/fUfTtDetnL5aPvblr NkR3LRHwfHTCNV0gcVqPdcVUNsEzJXqNF89v5GL9KPZUNWYd2/mGwoMqnzlTd2643yzCLhh2e 9/FvTv+1Mp98pWLtD/zOHfO3Ukif5VYijMSDbWYi4oTAadMLLzJAgAA X-Env-Sender: andrew.goodbody@cambrionix.com X-Msg-Ref: server-15.tower-140.messagelabs.com!1460987638!27648057!4 X-Originating-IP: [217.28.140.9] X-StarScan-Received: X-StarScan-Version: 8.28; banners=-,-,- X-VirusChecked: Checked From: Andrew Goodbody To: CC: , Andrew Goodbody Subject: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs Date: Mon, 18 Apr 2016 14:53:26 +0100 Message-ID: <1460987606-18125-2-git-send-email-andrew.goodbody@cambrionix.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1460987606-18125-1-git-send-email-andrew.goodbody@cambrionix.com> References: <1460987606-18125-1-git-send-email-andrew.goodbody@cambrionix.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [46.17.166.30] X-ClientProxiedBy: SEHSTE15FE05.hs20.net (172.18.251.45) To THHSTE15D2BE2.hs20.net (192.168.251.32) X-EXCLAIMER-MD-CONFIG: 266e7a57-cddd-49fd-bdea-19bca6d40303 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9144 Lines: 179 Adding a 2nd PHY to cpsw results in a NULL pointer dereference as below. Fix by maintaining a reference to each PHY node in slave struct instead of a single reference in the priv struct which was overwritten by the 2nd PHY. [ 17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180 [ 17.879557] pgd = dc8bc000 [ 17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000 [ 17.889213] Internal error: Oops: 17 [#1] ARM [ 17.893838] Modules linked in: [ 17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11 [ 17.904947] Hardware name: Cambrionix whippet [ 17.909576] task: dc859240 ti: dc968000 task.ti: dc968000 [ 17.915339] PC is at phy_attached_print+0x18/0x8c [ 17.920339] LR is at phy_attached_info+0x14/0x18 [ 17.925247] pc : [] lr : [] psr: 600f0113 [ 17.925247] sp : dc969cf8 ip : dc969d28 fp : dc969d18 [ 17.937425] r10: dda7a400 r9 : 00000000 r8 : 00000000 [ 17.942971] r7 : 00000001 r6 : ddb00480 r5 : ddb8cb34 r4 : 00000000 [ 17.949898] r3 : c0954cc0 r2 : c09562b0 r1 : 00000000 r0 : 00000000 [ 17.956829] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 17.964401] Control: 10c5387d Table: 9c8bc019 DAC: 00000051 [ 17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210) [ 17.977059] Stack: (0xdc969cf8 to 0xdc96a000) [ 17.981692] 9ce0: dc969d28 dc969d08 [ 17.990386] 9d00: c038f9bc c038f6b4 ddb00480 dc969d34 dc969d28 c042bb74 c042bae4 00000000 [ 17.999080] 9d20: c09562b0 c0954cc0 dc969d5c dc969d38 c043ebfc c042bb6c 00000007 00000003 [ 18.007773] 9d40: ddb00000 ddb8cb58 ddb00480 00000001 dc969dec dc969d60 c0441614 c043ea68 [ 18.016465] 9d60: 00000000 00000003 00000000 fffffff4 dc969df4 0000000d 00000000 00000000 [ 18.025159] 9d80: dc969db4 dc969d90 c005dc08 c05839e0 dc969df4 0000000d ddb00000 00001002 [ 18.033851] 9da0: 00000000 00000000 dc969dcc dc969db8 c005ddf4 c005dbc8 00000000 00000118 [ 18.042544] 9dc0: dc969dec dc969dd0 ddb00000 c06db27c ffff9003 00001002 00000000 00000000 [ 18.051237] 9de0: dc969e0c dc969df0 c057c88c c04410dc dc969e0c ddb00000 ddb00000 00000001 [ 18.059930] 9e00: dc969e34 dc969e10 c057cb44 c057c7d8 ddb00000 ddb00138 00001002 beaeda20 [ 18.068622] 9e20: 00000000 00000000 dc969e5c dc969e38 c057cc28 c057cac0 00000000 dc969e80 [ 18.077315] 9e40: dda7a40c beaeda20 00000000 00000000 dc969ecc dc969e60 c05e36d0 c057cc14 [ 18.086007] 9e60: dc969e84 00000051 beaeda20 00000000 dda7a40c 00000014 ddb00000 00008914 [ 18.094699] 9e80: 30687465 00000000 00000000 00000000 00009003 00000000 00000000 00000000 [ 18.103391] 9ea0: 00001002 00008914 dd257ae0 beaeda20 c098a428 beaeda20 00000011 00000000 [ 18.112084] 9ec0: dc969edc dc969ed0 c05e4e54 c05e3030 dc969efc dc969ee0 c055f5ac c05e4cc4 [ 18.120777] 9ee0: beaeda20 dd257ae0 dc8ab4c0 00008914 dc969f7c dc969f00 c010b388 c055f45c [ 18.129471] 9f00: c071ca40 dd257ac0 c00165e8 dc968000 dc969f3c dc969f20 dc969f64 dc969f28 [ 18.138164] 9f20: c0115708 c0683ec8 dd257ac0 dd257ac0 dc969f74 dc969f40 c055f350 c00fc66c [ 18.146857] 9f40: dd82e4d0 00000011 00000000 00080000 dd257ac0 00000000 dc8ab4c0 dc8ab4c0 [ 18.155550] 9f60: 00008914 beaeda20 00000011 00000000 dc969fa4 dc969f80 c010bc34 c010b2fc [ 18.164242] 9f80: 00000000 00000011 00000002 00000036 c00165e8 dc968000 00000000 dc969fa8 [ 18.172935] 9fa0: c00163e0 c010bbcc 00000000 00000011 00000011 00008914 beaeda20 00009003 [ 18.181628] 9fc0: 00000000 00000011 00000002 00000036 00081018 00000001 00000000 beaedc10 [ 18.190320] 9fe0: 00083188 beaeda1c 00043a5d b6d29c0c 600b0010 00000011 00000000 00000000 [ 18.198989] Backtrace: [ 18.201621] [] (phy_attached_print) from [] (phy_attached_info+0x14/0x18) [ 18.210664] r3:c0954cc0 r2:c09562b0 r1:00000000 [ 18.215588] r4:ddb00480 [ 18.218322] [] (phy_attached_info) from [] (cpsw_slave_open+0x1a0/0x280) [ 18.227293] [] (cpsw_slave_open) from [] (cpsw_ndo_open+0x544/0x674) [ 18.235874] r7:00000001 r6:ddb00480 r5:ddb8cb58 r4:ddb00000 [ 18.241944] [] (cpsw_ndo_open) from [] (__dev_open+0xc0/0x128) [ 18.249972] r9:00000000 r8:00000000 r7:00001002 r6:ffff9003 r5:c06db27c r4:ddb00000 [ 18.258255] [] (__dev_open) from [] (__dev_change_flags+0x90/0x154) [ 18.266745] r5:00000001 r4:ddb00000 [ 18.270575] [] (__dev_change_flags) from [] (dev_change_flags+0x20/0x50) [ 18.279523] r9:00000000 r8:00000000 r7:beaeda20 r6:00001002 r5:ddb00138 r4:ddb00000 [ 18.287811] [] (dev_change_flags) from [] (devinet_ioctl+0x6ac/0x76c) [ 18.296483] r9:00000000 r8:00000000 r7:beaeda20 r6:dda7a40c r5:dc969e80 r4:00000000 [ 18.304762] [] (devinet_ioctl) from [] (inet_ioctl+0x19c/0x1c8) [ 18.312882] r10:00000000 r9:00000011 r8:beaeda20 r7:c098a428 r6:beaeda20 r5:dd257ae0 [ 18.321235] r4:00008914 [ 18.323956] [] (inet_ioctl) from [] (sock_ioctl+0x15c/0x2d8) [ 18.331829] [] (sock_ioctl) from [] (do_vfs_ioctl+0x98/0x8d0) [ 18.339765] r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20 [ 18.345822] [] (do_vfs_ioctl) from [] (SyS_ioctl+0x74/0x84) [ 18.353573] r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0 [ 18.361924] r4:00000000 [ 18.364653] [] (SyS_ioctl) from [] (ret_fast_syscall+0x0/0x3c) [ 18.372682] r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000 [ 18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180) [ 18.387580] ---[ end trace c80529466223f3f3 ]--- Signed-off-by: Andrew Goodbody --- v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it has data->slaves initialised first which is needed to calculate size drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 42fdfd4..e62909c 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -349,6 +349,7 @@ struct cpsw_slave { struct cpsw_slave_data *data; struct phy_device *phy; struct net_device *ndev; + struct device_node *phy_node; u32 port_vlan; u32 open_stat; }; @@ -367,7 +368,6 @@ struct cpsw_priv { spinlock_t lock; struct platform_device *pdev; struct net_device *ndev; - struct device_node *phy_node; struct napi_struct napi_rx; struct napi_struct napi_tx; struct device *dev; @@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv) cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast, 1 << slave_port, 0, 0, ALE_MCAST_FWD_2); - if (priv->phy_node) - slave->phy = of_phy_connect(priv->ndev, priv->phy_node, + if (slave->phy_node) + slave->phy = of_phy_connect(priv->ndev, slave->phy_node, &cpsw_adjust_link, 0, slave->data->phy_if); else slave->phy = phy_connect(priv->ndev, slave->data->phy_id, @@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv, struct device_node *node = pdev->dev.of_node; struct device_node *slave_node; struct cpsw_platform_data *data = &priv->data; - int i = 0, ret; + int i, ret; u32 prop; if (!node) @@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv, } data->slaves = prop; + priv->slaves = devm_kzalloc(&pdev->dev, + sizeof(struct cpsw_slave) * data->slaves, + GFP_KERNEL); + if (!priv->slaves) + return -ENOMEM; + for (i = 0; i < data->slaves; i++) + priv->slaves[i].slave_num = i; + if (of_property_read_u32(node, "active_slave", &prop)) { dev_err(&pdev->dev, "Missing active_slave property in the DT.\n"); return -EINVAL; @@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv, if (ret) dev_warn(&pdev->dev, "Doesn't have any child node\n"); + i = 0; for_each_child_of_node(node, slave_node) { struct cpsw_slave_data *slave_data = data->slave_data + i; const void *mac_addr = NULL; @@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv, if (strcmp(slave_node->name, "slave")) continue; - priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0); + priv->slaves[i].phy_node = + of_parse_phandle(slave_node, "phy-handle", 0); parp = of_get_property(slave_node, "phy_id", &lenp); if (of_phy_is_fixed_link(slave_node)) { struct device_node *phy_node; @@ -2292,16 +2302,6 @@ static int cpsw_probe(struct platform_device *pdev) memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN); - priv->slaves = devm_kzalloc(&pdev->dev, - sizeof(struct cpsw_slave) * data->slaves, - GFP_KERNEL); - if (!priv->slaves) { - ret = -ENOMEM; - goto clean_runtime_disable_ret; - } - for (i = 0; i < data->slaves; i++) - priv->slaves[i].slave_num = i; - priv->slaves[0].ndev = ndev; priv->emac_port = 0; -- 2.5.0