From: Kangjie Lu <kjlu@umn.edu> To: kjlu@umn.edu Cc: pakki001@umn.edu, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, Bjorn Helgaas <bhelgaas@google.com>, Michal Simek <michal.simek@xilinx.com>, 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 [thread overview] Message-ID: <20190314055851.6884-1-kjlu@umn.edu> (raw) In case __get_free_pages fail, the fix returns to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu <kjlu@umn.edu> --- 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
WARNING: multiple messages have this Message-ID (diff)
From: Kangjie Lu <kjlu@umn.edu> To: kjlu@umn.edu Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, linux-pci@vger.kernel.org, Michal Simek <michal.simek@xilinx.com>, linux-kernel@vger.kernel.org, pakki001@umn.edu, Bjorn Helgaas <bhelgaas@google.com>, linux-arm-kernel@lists.infradead.org Subject: [PATCH] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages Date: Thu, 14 Mar 2019 00:58:51 -0500 [thread overview] Message-ID: <20190314055851.6884-1-kjlu@umn.edu> (raw) In case __get_free_pages fail, the fix returns to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu <kjlu@umn.edu> --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-03-14 5:59 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-03-14 5:58 Kangjie Lu [this message] 2019-03-14 5:58 ` [PATCH] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages Kangjie Lu 2019-03-22 16:26 ` Steven Price 2019-03-22 16:26 ` Steven Price 2019-03-25 21:31 ` [PATCH v2] " Kangjie Lu 2019-03-25 21:31 ` Kangjie Lu 2019-03-25 21:51 ` Bjorn Helgaas 2019-03-25 21:51 ` Bjorn Helgaas 2019-03-25 22:19 ` [PATCH v3] PCI: xilinx: Check for __get_free_pages() failure Kangjie Lu 2019-03-25 22:19 ` Kangjie Lu 2019-03-26 11:40 ` Steven Price 2019-03-26 11:40 ` Steven Price 2019-03-27 13:36 ` Mukesh Ojha 2019-03-27 13:36 ` Mukesh Ojha 2019-03-29 16:36 ` Lorenzo Pieralisi 2019-03-29 16:36 ` Lorenzo Pieralisi
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