From mboxrd@z Thu Jan 1 00:00:00 1970 From: aospan@netup.ru (Abylay Ospan) Date: Fri, 13 Jan 2017 03:20:17 +0300 Subject: [PATCH] PCI: iproc: fix kernel crash if dev->of_node not defined Message-ID: <1484266817-6725-1-git-send-email-aospan@netup.ru> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org pcie->dev->of_node not always defined (NULL) and can cause crash: [ 19.053195] Unable to handle kernel NULL pointer dereference at virtual address 00000020 [] (of_n_addr_cells) from [] (iproc_pcie_setup+0x30c/0xce0) this patch adds sanity check to prevent crash. Signed-off-by: Abylay Ospan --- drivers/pci/host/pcie-iproc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c index 3ebc025..f2836a9 100644 --- a/drivers/pci/host/pcie-iproc.c +++ b/drivers/pci/host/pcie-iproc.c @@ -952,6 +952,9 @@ static int pci_dma_range_parser_init(struct of_pci_range_parser *parser, const int na = 3, ns = 2; int rlen; + if (!node) + return -ENOENT; + parser->node = node; parser->pna = of_n_addr_cells(node); parser->np = parser->pna + na + ns; -- 2.7.4