Path: csiph.com!news.mixmin.net!aioe.org!bofh.it!news.nic.it!robomod From: Kamal Mostafa Newsgroups: linux.kernel Subject: [PATCH 4.2.y-ckt 281/305] net: phy: mdio-mux: Check return value of mdiobus_alloc() Date: Sat, 16 Jan 2016 01:20:02 +0100 Message-ID: References: X-Mailer: git-send-email 1.9.1 X-Extended-Stable: 4.2 Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 42 Organization: linux.* mail to news gateway X-Original-Cc: Tobias Klauser , "David S. Miller" , Kamal Mostafa X-Original-Date: Fri, 15 Jan 2016 16:01:35 -0800 X-Original-Message-ID: <1452902519-2754-282-git-send-email-kamal@canonical.com> X-Original-References: <1452902519-2754-1-git-send-email-kamal@canonical.com> X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: csiph.com linux.kernel:1310590 4.2.8-ckt2 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Tobias Klauser commit 20b08e1a793d898f0f13040d5418ee0955f678cf upstream. mdiobus_alloc() might return NULL, but its return value is not checked in mdio_mux_init(). This could potentially lead to a NULL pointer dereference. Fix it by checking the return value Fixes: 0ca2997d1452 ("netdev/of/phy: Add MDIO bus multiplexer support.") Signed-off-by: Tobias Klauser Signed-off-by: David S. Miller Signed-off-by: Kamal Mostafa --- drivers/net/phy/mdio-mux.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c index 4d4d25e..ac8a823 100644 --- a/drivers/net/phy/mdio-mux.c +++ b/drivers/net/phy/mdio-mux.c @@ -148,9 +148,14 @@ int mdio_mux_init(struct device *dev, } cb->bus_number = v; cb->parent = pb; + cb->mii_bus = mdiobus_alloc(); + if (!cb->mii_bus) { + ret_val = -ENOMEM; + of_node_put(child_bus_node); + break; + } cb->mii_bus->priv = cb; - cb->mii_bus->irq = cb->phy_irq; cb->mii_bus->name = "mdio_mux"; snprintf(cb->mii_bus->id, MII_BUS_ID_SIZE, "%x.%x", -- 1.9.1