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[128.101.106.63]) by smtp.gmail.com with ESMTPSA id w8sm682394ita.21.2019.03.13.22.58.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 13 Mar 2019 22:58:56 -0700 (PDT) From: Kangjie Lu To: kjlu@umn.edu Cc: pakki001@umn.edu, Lorenzo Pieralisi , Bjorn Helgaas , Michal Simek , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages Date: Thu, 14 Mar 2019 00:58:51 -0500 Message-Id: <20190314055851.6884-1-kjlu@umn.edu> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In case __get_free_pages fail, the fix returns to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu --- drivers/pci/controller/pcie-xilinx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c index 9bd1a35cd5d8..b7083e995c45 100644 --- a/drivers/pci/controller/pcie-xilinx.c +++ b/drivers/pci/controller/pcie-xilinx.c @@ -341,6 +341,9 @@ static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port) phys_addr_t msg_addr; port->msi_pages = __get_free_pages(GFP_KERNEL, 0); + if (unlikely(!port->msi_pages)) + return; + msg_addr = virt_to_phys((void *)port->msi_pages); pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1); pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2); -- 2.17.1